Price wise have you looked into a spay/neuter clinic? Something offered by a good mobile unit or the Humane Society in your area? I ask because I have a boy and even with an undescended testicle making the surgery longer it was only $100 to neuter him (a normal neuter was $75). A spay through them is only $90. Maybe talk to a reputable rescue in your area and ask what clinic they take their Boxer rescues to for a better rate?
Personally we had the regular scalpal method done, laser was not an option. He had dissolving stitches and had no issues. Oh and there was no bloodwork, even my regular vet doesn't do bloodwork on an otherwise healthy dog.
Also I had my boy neutered at 6 months. Personally, for us, that timeline wouldn't change boy or girl.
A mobile unit is a good option if necessary but honestly, if money isn't really an issue, I would suggest a regular vet clinic. My reasoning is is because the mobile clinics are very fast paced. Our local animal welfare has a partnership with a mobile clinic (a very reputable one at that) that I have volunteered on several times. Our vet is very thorough and does her job well but there is definitely a focus on speed. I schedule all the surgeries and we do at least 70 surgeries in two days but it is usually closer to 90 in two days. On our mobile, there is the vet and two vet techs and then one or two volunteers. The volunteers do pretty much what the vet techs do. When I am on the mobile, I do the after surgery stuff of giving rabies and FVRCP vaccinations, treating ear mites, give fluids, etc. Then put the cat in a cage. All of this in a matter of minutes because the table needs to be cleared for the next cat coming out of surgery. The cat stays in the cage until it starts lifting its head and then it is sent to recovery where more volunteers just keep an eye on them.
Personally, I like to think animals get more one on one attention in an actual vet clinic. I don't know if that is true or not but at least I know they are better equipped in an actual vet clinic. On the mobile, the equipment is limited to what is needed for spays and neuters, space is very limited. We can alter puppies as long as they are 2-3 pounds and kittens that are only 2 pounds...TINY!
Don't get me wrong, I love mobile spay/neuter clinics and what they are able to do. I have nothing against them, especially for people who have no other option but I would rather spend more so that I have more assurance. We have never lost an animal on our mobile and hope we never do but it is always a possibility and if it happened, there would be less resources available to help.
**please note, I am not bashing mobile clinics, just giving more info.
With that said, I paid I think $250 for a traditional spay with heart monitoring (Abbie has an arrhythmia) and an IV for quick access in case of emergency. I also opted for the bloodwork.
Good luck and whatever option you choose, I am sure she will be fine!