wiley, the crystals themselves do not shut the kidneys down. if the crystals are big enough, sometimes when a cat tries to pee a crystal will get stuck in their urethra and cause a blockage, which makes the cat unable to urinate. the inability to urinate is what causes the kidneys to fail, and a blocked cat can die within 24 hours of their blocking, if not taken to the vet right away and ublocked. blocking is mainly a male cat problem, it is pretty rare for a female to develop a urinary blockage from having crystals/stones in their bladder.
since the OP is seeing blood in the urine, then the cat is obviously urinating. the blood can be from a simple infection, to having bladder stones which are irritating the lining of the bladder and thus causing her to urinate blood.
she needs to have a urinalysis done by your vet to determine whether it is a simple infection or stones, and to determine which antibiotics to be put on.
let us know how she is.
Our lives begin to end the day we become silent about things that matter.
Scout your right, that is what I meant. Should have taken more time to type it out. One of my cats had this years ago so I know first hand what can happen. The cat was treated and still with me to this day.
Low ash food and more water will prevent this to happen again.