If the Chemo is going well, and your dog is not in any pain, then I would go forward with it. If you feel your dog is in to much pain, it would be best to have her put down. I know how hard this must be. Good luck which ever you decide.
I think it depends on ypu and your dog. my 6 year old cocker spaniel was diagneosed with lymphoma one year ago. i started him on chemo one year ago, and he has been in remission and doing great since. i'm soglad that i opted to try chemo. good luck with your dog.