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.
"When I think of Mick Jagger still singing that he can't get any satisfaction in over forty years of being in the Rolling Stones, I have to conclude that he's either lying or not all that bright." -- Henry Rollins