Your cat should be given prescription food like C/D or Science
Diet. BUT, if you do not want to use prescribed food, then think of what a cat with UTI needs the most: water to flush and get rid of bacteria. So, the more water the better. Canned food can be good for her. There is a commercial brand very good for cats called Natural Balance. It is expensive but it's got no by-products, fillers or preservatives, at least the label is free from those.