Reddit mentions of Everyday Health and Fitness With Multiple Sclerosis: Achieve Your Peak Physical Wellness while Working with Limited Mobility

I admire your mom for her desire to stay active. I was also diagnosed the week before my 50th. A couple of key things of importance is hydration and staying cool. According to my neuro, hydrate, hydrate, hydrate. I struggle with getting the water down but find it easier to add lemon and hot water in winter just because I like warm drinks in winter. Also in the summer I try to stay as cool as possible and have a scarf which I put in the freezer and wrap around my neck to stay cool. There are many cooling vests available which I haven't yet tried and may be worth looking into as it is important to not overheat.
As for exercises u/LDP78 trained for a long cycling ride by starting slow and building up to it. Very inspiring. There are others who do run long races and marathons as my neuro went to cheer them on at the finish line.
A website to check out is the MS Fitness Challenge run by David Lyons and his wife. David was and still is a fitness professional and bodybuilder diagnosed with MS. He has a book coming out February 1, 2017 Everyday Health and Fitness with MS. I have pre-ordered mine and am so excited for it. https://www.amazon.com/Everyday-Health-Fitness-Multiple-Sclerosis/dp/1592337414/ref=asap_bc?ie=UTF8
As for other types of exercises she may enjoy swimming and pilates. Here is a great video for stretching, pilates for MS I just found https://multiplesclerosisnewstoday.com/2017/01/10/pilates-exercises-for-multiple-sclerosis/
I also like Jack Osbourne You Don't Know Jack About MS and Lisa Cohen Rockstar Women with MS.
I'm sure your Mom really appreciates your support. My boys are also a huge support system. I have told them I want/need to pick up my workouts and goals and I know they and my husband are my huge cheering squad. You are doing a great job educating yourself about MS to support your Mom. Keep up the great work!