Very sorry to hear this...I have to say, I wondered if it was going to be that. Chewbecca's dog-Ella had it and I think it started similarly, but I didn't want put bad ju ju out there Big hug to you guys, please let us know what you decide to do.
Sending all my best to you guys. Chemotherapy is a scary choice, even the word or thought of it, though I have known many dogs that did very well on chemotherapy. They seemed much gallery and comfortable than the humans I know that have had been undergoing chemotherapy.
Whatever you decide, I'm glad she's feeling well right now. I hope she stays that way for a long long time.