I too have a female pup (4months) and am having problems with her. Really, the same that everyone has already mentioned. She is taken out and goes pee and poop and then fifteen minutes later pees in the apartment. She knows that it is wrong and when is caught in the act she runs (leaving a nice trail for me to clean!!!) and hides. Since I live in an apartment I am hoping to paper train her so that when she does get old enough she will have a place to eliminate. If I put my hands on her sides and walk her over to the paper, pick her up and place her on the paper, or say come on, lets go potty and get her to walk over to the paper on her own, she will pee on the paper. However, any other time she will just pee all around the apartment.
I am currently trying the crate training to help with her potty training also. The problem with that was that when I put her in there for an hour or so in order to make her hold it she would pee in the crate instead of making any kind of noise to alert me that she has to go. She did this even when I was right next to her kennel!! I did notice one thing about peeing in the kennnel. Everytime she did it, I would clean it up right away. Then, I realized that by doing this, she didn't have any negative consequences when eliminating there. So, one day when I was TWO FEET from her kennel and she peed in it, I yelled No! and then, I left her in there for about 15 minutes. At first, she just stood there then, she looked a little confused and really hesitant to sit down. She finally sat but just had that sad look that Boxers are so famous for. I think she got the point! Since then, she hasn't peed in the kennel when I've been home. However, sometimes she will pee in it when I'm gone for 2-3 hours.
I must add that she does currently have a bladder infection and we're treating it. But, I definitely also experience the frustration and have even cried because I'm so upset and frustrated and REALLY tired of cleaning up pee. My boyfriend and I were so disgusted with the carpet (WAS brand new when we moved into our apartment! Oops!! Hee Hee!) that we bought a steam cleaner ($200) to clean the entire carpet. It's great to get the smell up and since then, she has had less accidents! If you could, I would recommend getting one! It's still pretty frustrating though. Especially since we have another Boxer (14 months, Male) who was so easy to potty train (less than a month) at 9 weeks. Maybe it has something to do with females and anatomy or maybe in our case, I think that she gets distracted by our other Boxer and forgets about going on the paper! Something else that could be the problem is that her breeder lived in a house and had a dog door so, when I got her she was almost completely pottied trained for going through the door and eliminating outside. I think that she is probably confused about this change. I agree with earlier posts that sometimes what they learn as puppies really sticks with them.
I can't really offer any advice other than what other people have said and obviously, if I had any good advice, I probably would'nt be having this problem also.
For my boy, we did the following that we found in a book...pretty standard stuff.
It was easy since I was at home during that time all day so I would take him outside (we lived in a house) every 45 minutes-1 hour. When he pottied outside I praised him vocally and with a liver treat. Then, we stayed outside for a few minutes as another reward so that he didn't learn by mistake that peeing meant going back inside (a negative thing! they'd rather be outside!)
Then, once back inside we played with a toy for 15-20 minutes or so at which time I was right next to him. Then, I would hold him in my lap and play with a toy. Often, he would nap after playing. Otherwise, after playing, I would put him in his kennel for another hour and then, take him out to go pee again (cycle repeats) If he fell asleep, he stayed in there until he woke up and then, he would go outside.
Regarding meals, he was taken outside first to eliminate and then offered food. When he finished, he went back in his kennel for 30-45 minutes and then, was taken outside again to eliminate (they often eliminate 1/2 hour after eating).
If at anytime he did not eliminate when he was taken outside, I would put him right back in his kennel!!! Then, 15-20 minutes later I would take him outside again and would do this until he finally eliminated. That way, he learned that if he eliminated when taken out of his kennel and brought outside he got to play!!
I think this is a pretty standard way to potty train and for us it was extremely easy to do with our boy Boxer. However, with our girl Boxer, it's a different story. We joke that she has a learning disorder or ADD because she's just so reluctant to learn! If this method is similar to what you tried then, you got me 'cause I don't exactly know what else to do myself! If I find out anything else, I'll post! Otherwise, good luck, don't give up, and get some glade plug-ins!!!!!! :D