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.
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.
Post Edited (Sunnycitrus) : 11/9/2007 12:21:42 PM (GMT-7)