Exercises needed for Post Polio syndrome and MS

I have a 62 yr old new client with MS, post-polio syndrome, crohns & colitis. She is 117 lbs. 4'11 , med frame. Fused spine from C2-Sacrum, In a wheelchair, but can transfer to the trap table, no ability to move left arm or leg, right side still has some ability to move, but the movement is an inch or so in each direction. Her goal is to lose weight, My goal for her is to keep as much core strength as possible so she can continue to sit for as long as possible before her disease progresses to the point where she is no longer able to sit.