I have heard that chemo is not as hard on cats as it is on humans. But I don't know that for a fact, some other folks here would. You might also ask your vet what she would do if it was her cat.
Craftlady, who posts here, has had remarkable results with Reiki. It can't hurt, if you know a good practicioner.
HUGS - I love that baby pic of her! She is a gorgeous girl.
I know whatever you do will be from love.
"Remember that children, marriages, and flower gardens reflect the kind of care they get." -- H. Jackson Brown, Jr.