You Mom is very lucky to have you and I applaud you for your willingness to understand her disease and to help her. Tgal has given you some very good advice. I would just add that your Mom's fatigue will be such that you may not understand the gravity of it. It is literally a debilitating fatigue where simple tasks will feel like she's run a 26 mile long marathon. Understanding that and knowing that any type of help and assistance you can give her will work wonders. Simple things like offering to brush her hair because it tires her out to have her arms up long enough to do it herself.
Chron's disease is another auto-immune disease and once we get one, we are susceptible to getting others. Most of us here suffer from more than one auto-immune disease (I, myself, have four). Most medications that work for one also works for the others. However, another important thing for you to understand is that each medication comes with it's own set of side effects. As such, it would be of great help to your Mom if you understood the purpose for each of her meds and what their side effects are.
As Tgal mentioned, help her as much as you can so that she does not get fatigued and so that she can get appropriate rest. Also, help her to avoid any unnecessary stress. Most of all, keep doing what you are doing; caring, loving, supporting, and learning as much as you can about her diseases and how they affect her.
We are here to help you as much as we can. Please read the sticky's at the top of each forum, they are filled with great information and may answer a lot of your questions. Also, please feel free to ask any question that you may have and we will do all that we can to provide answers for you. I wish you and your Mom the very best.\
Peace and Blessings
Look For The Good and Praise It!