I am sorry that your mother is suffering from c-dif. I haven't had any experience with that particular disease, but I know how challenging it can be to keep our elderly healthy. Have you tried any of the protein drinks or ensure to add calories to your mother's diet. I would suggest going to a health food store and see what they might suggest that will fit into a bland diet that will supply the vitamins and minerals your mother needs.
Meanwhile, SEAandSKY has given you some good news. The fact that Questran has worked for her husband is reassuring. Do know that we are here for you, Maverick, and hoping for the best for you and your mom. God Bless You!
Love and Hugs from Glenda