Hi Mlherh and welcome,
I did a bit of looking on the web for information on psychosis and MS, and found little blurbs here and there. The following link has information that is pretty representative of what I found, but it also has some links for further reading at the bottom of the page.
http://www.themcfox.com/multiple-sclerosis/ms-symptoms/psychosis.htm
Another option might be to contact the National MS Society and see if they can provide you with some additional information.
I hope your sister-in-law can get some help soon. It so great that you are looking into this for her. I did go to the Mayo Clinic in Arizona, and had a really positive experience. My situation is nowhere near as serious or complex as what your sister-in-law is going through (I do not have psychosis nor am I dxed with MS at this point), but feel free to contact me and I can give you additional details about my experience if you are interested...you can click on my name in the left column to find my email address.
Sunny
Post Edited (Sunnycitrus) : 11/9/2007 12:21:42 PM (GMT-7)