Aside from nutrition mentioned Astronuc I have a suggestion that might be taken with a grain of salt, but I would suggest doing a little research on it- but honestly I think it might help and prob not a suggestion you will hear to often.
Pot brownies- I know that sounds a bit strange, but cannibinoids fight cancer in two ways- one is through activation of the P53 gene which causes a tumor suppressant to be secreted. This tumor suppressant re-enables cellular apoptosis (programmed cell suicide) this is important because ALL known cancers turn this ability off in their development. Secondly- it is a blood flow regulator that works based on localized stimuli meaning- in a tumor it is a vasoconstrictor AND reduces the growth rate of new blood supply vessels (even into negative ratio) while doing the complete opposite in say an eye with glaucoma. Actually even smoking it ok for this as it acts as a delivery method that will continue to seep into the lung tissue (why pot smokers (heavy) do not have increased rate of lung cancer) Pot brownies are also great for the gastrointestinal tract. Being your mother is a non smoker and vegetarian I suspect that brownies would be the delivery method least worried about.
On a secondary note, she is no doubt quite stressed which may be wreaking a bit of havoc on her hippocampus, marijuana halts this damage and slowly reverses it.
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"Marijuana Does Not Raise Lung Cancer Risk" -UCLA
http://www.foxnews.com/story/0,2933,196678,00.html
-"We know that there are as many or more carcinogens and co-carcinogens in marijuana smoke as in cigarettes," researcher Donald Tashkin, MD, of UCLA's David Geffen School of Medicine tells WebMD. "But we did not find any evidence for an increase in cancer risk for even heavy marijuana smoking." Carcinogens are substances that cause cancer."
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Marijuana Cuts Lung Cancer Tumor Growth In Half, Study Shows" -Harvard
http://www.sciencedaily.com/releases/2007/04/070417193338.htm
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""CB1. In this study we report that tetrahydrocannabinol (5 μM) evokes a rapid phosphorylation, and thus activation, of the tumour suppressor protein, p53, in a manner involving the cannabinoid CB1 receptor, and the stress-activated protein kinase, c-jun N-terminal kinase, in cultured cortical neurons"
-Revue / Journal Title
European journal of pharmacology ISSN 0014-2999 CODEN EJPHAZ
Source / Source
2007, vol. 564, no1-3, pp. 57-65 [9 page(s) (article)] (1 p.)"