I'm not too sure of the answers for your first 2 questions, but I do know the answer for your second 2. I work at a Veterinary Clinic as a Veterinarian Assistant, so I know the recovery time/procedure. I have only witnessed a spay once, and that was with Sunny. So, I don't know too much about the best anesthetic to use or method of surgery. But I just thought I would share what I do know.
During the first 10 days post-op you should keep Maya as inactive as possible. No jumping, running, etc. Also, when outside try to limit it to leash walking only. Make sure that Maya doesn't try to lick or chew the sutures. Keep the incision clean and dry. And check for redness, swelling, and discharge daily. Where I work use disolvable stiches, so you don't have to worry about getting the them removed.
Be careful where you take Maya to though. One of our clients wanted to have their 2 puppies ears' cropped (which we don't do). So, she went to a Clinic near where I work to have it done. Well anyways, one of the puppies didn't make it through the surgery. And they say that it was because of the anesthetic. I'm not sure what it was, as I said before I don't know anything about that. For all I know it may not have even been what this clinic is claiming. Well, good luck. And thank you for making the decision to have Maya spayed. It is the healthiest one for her.
Rachel, Sunny, and Champ