I did a bit of Goggling on this and it seems that many tests hv/are being carried out on the help cannabis can provide to MS patients. Have u done this? Theres lots of information from positive sources that should provide plenty of info for ur mum.

The MS Society has a good section on cannabis use, worth havin a flick thro whts on there. Being a well know charity ur mum might follow some of the advise they give...
http://www.mssociety.org.uk/research...nnabis_ms.html

Please let us knw if/when she decides to give it a go n if it helped.
*hugs* socks xxx

http://news.bbc.co.uk/1/hi/health/662254.stm
http://news.bbc.co.uk/1/hi/sci/tech/3644628.stm