I’m so sorry for your daughter! That’s so rough to be going through that for anyone, especially someone so young. I hope she goes into remission and leads a long, healthy, happy life (with the same for you in it, too)! I definitely recommend adding probiotic-rich foods to her diet. It helps a lot, and restoring the microbiome helps most people with inflammatory bowel disease. Check out r/fermentation, Bon Appetit’s It’s Alive With Brad , and The Art of Fermentation by Sandor Katz. Best of luck to you and her!!
Read. Once you've finished reading, read more. Curing/fermentation covers many different food groups, but it can give you a real sense of the dangers that you want to prevent.
This is a good start
I understand that salt is something that people may want to avoid if they are needing to change their diets for medical reasons, at the same time food poisoning can be super dangerous.
I learned a lot from this book https://www.amazon.com/Art-Fermentation-Depth-Exploration-Essential/dp/160358286X/ref=pd_aw_sim_14_1/141-9392639-3475907?_encoding=UTF8&pd_rd_i=160358286X&pd_rd_r=ad73a6dd-977b-11e9-b2ee-5b6c9b26c131&pd_rd_w=2FWGn&pd_rd_wg=DhXl9&pf_rd_p=469620d9-3e90-496d-9dc8-b19f900ba5fe&pf_rd_r=89JTX3VZH5RRJTZNX1WJ&psc=1&refRID=89JTX3VZH5RRJTZNX1WJ
It isn't focused entirely on alcohol fermentation, but it helped me understand the growth stages of yeast and the secondary ferments in wines (example, malic acid to lactic acid)
The author also has an interesting blog.
 - https://www.amazon.com/Art-Fermentation-Depth-Exploration-Es... - https://www.wildfermentation.com/
 - https://www.wildfermentation.com/