[chico2]

I really only had one male cat with crystals and he got soo bad(about 30yrs ago)he had to be put down.
It was due partly to my ignorance at that time,when only Purina Cat Chow and Pussin'Boots canned was available.
But I still remember my wonderful vet at the time saying,NEVER feed a cat dry food only.
It makes sense to me,cats are not great drinkers generally,although mine are.
Your friend could make it a slow transition,mixing the dry with canned,but she would have to get a good quality grain-free food even add a liittle water to it.
I should point out,in case she only has one cat and puts leftovers in the fridge,cats do not like cold food from the fridge,adding a little warm water will help.
I just wanted to add,poor kitty always eating the same food,imagine eating meatloaf every day for six years...my cats are fed a variety of different kinds,just like people.
Thank's for asking for your friend,I am sure Sugarcatmom will hellp out soon,probably busy on Mothers Day..