Hi Cris,
I have heard of others who did a lower dose of Tem. It sounds like your mother's doctor is a careful and kind person who wants to give her the best chances but is also aware of the risks. Most importantly, it sounds like both he and all her family like you are really listening to what SHE wants. Even if she's confused, clearly she still wants to give the chemo another chance. Is there any chance that the AVASTIN could be tried? It wouldn't affect her blood counts and might help with slowing the tumors.
Wishing you all the best!
Hugs and hope,
Sarah
mother of Andy 27 dx gbm/pnet 1/09