Oh Gail, I only just read this whole thread. I am so dreadfully sorry. I would have done exactly the same as you in your situation. Until I was 100% sure, I'd always do whatever I could to extend life. Go with your gut. Flecka will tell you when she's ready, and you love her so very much, you will know when it's the right time.
Keeping you in my thoughts and sending many hugs. Hang in there. :grouphug :grouphug