Urgh, that's not a great fate -- but it's great that she knows and hopefully gets support! If your father is not supportive, depending on your level of meanness, send him news about people dying of colon cancer and all the other diseases scientifically proven to be results of not or of badly managed Celiac's.

...wow, that escalated fast. Sorry. I may have some issues with a certain parent endangering the health of family members and being an ass about it.

Anything you can tell me is appreciated.

The comment above is helpful: Wheat, rye, and barley are the culprits, and I'd focus on them. The bad, that stuff's in a lot of foods -- but the good is, less so in the United States! Everything here is corn-based, which has its own downsides but generally doesn't trigger many people.

General Info on GF Eating:

Pretty handy primer: http://www.med.umich.edu/1libr/MEND/Celiac.pdf

https://celiac.org/live-gluten-free/glutenfreediet/food-options/

http://www.celiaccentral.org/Gluten-Free-Food/the-gluten-free-diet/

Food blogs I follow, because they have gf options or good tips:

http://civilizedcavemancooking.com/periscope/10-tips-for-gluten-free-baking/

http://smittenkitchen.com/blog/category/gluten-free/

http://glutenfreegoddess.blogspot.com/ is a little too crunchy for me, but eh, I've baked some of her stuff with modifications

And, advanced, for going out, I use this:

http://www.findmeglutenfree.com/