Thank you everyone for your wonderful suggestions!
We were able to collect a sample yesterday morning from the litter box lined with plastic wrap. Hubby tilted the box while I syringed out a small sample. The vet examined it yesterday and concluded she does have crystals and prescribed 250 mg of Cephalexin, twice daily.
We took Kitty back tonight for a Complete Blood Count sample and will know the results of this test tomorrow morning to see how her kidney's are functioning.
In the meantime, we are slowly introducing her to the Medi Cal Urinary SO food but, I am not a big fan of Royal Canin foods.
I did some research on alternatives and a few people wrote about Petcurean NOW cat food.
If anyone has any other suggestions about how to control mineral concentration, I'd be open for suggestions.
Thanks again everyone.