i'm so glad to hear she's feeling better and life is getting back to normal.
only one of my vets asked about anal glands, the one i consider to be the best of all I've seen, the one who asked the right questions and shows a lot of 'thinking on her feet" intelligence. she asked if zack had been scooting, i was surprised because i had brought him in for something that didn't have GI symptoms. I answered hesitantly that he had had some scooting, it was uncommon and i didn't think it necessarily needed treatment. She expressed the glands and told me there wasn't that much in there, i don't think he needed it done. And following the procedure, he started scooting a lot and i was told when i spoke to the vet that this was normal after anal gland expression.
As for whether an infection was spread by an unclean medical tool, you'll never be able to find that out. Theoretically it could've happened, but who knows?
That she was getting better even before the flagyl is interesting, diagnositically. How was it determined that it was a bacterial infection? Did they culture it and find out what kind of bacteria it was? What was the basis for saying it as a bacterial infection?
anyway, again, it's great that she is doing better. And it's great that youll be having insurance on her.