Sounds like you're doing everything right to get her back in good health. I'm glad to see she made it to a loving and caring home. I don't know anything about the fluid bubbles, I'm sorry I can't help with that but I do hope she gets better soon. You certainly didn't fail her at all, so a little mistake happened but you are definitely taking much, much better care of her than her previous owner. Also, the images you posted aren't showing up, it says "404 - image not found".