What is wrong with your 5 year old female rabbit if it has red smelly urine?

I have one rabbit with extremely smelly urine with what seems to be minor bladder sludge issues now and she's 5 yrs old. She has also tested positive for pasturella when we first got her and brought her to the vet. Their urine can range in color from almost clear to complete chalky red yellow brown white....

I'm currently worried mine either has way too much calcium in her diet causing the sludge or a UTI. I'm hoping to get her to the vet and have a culture or urinalysis run on her to determine what's going on. I have 2 spayed female rabbits and this is the one that has always had strong smelling nasty urine issues since young and she never lets on that it's an issue and I have had a urinalysis run on her a few years back and she tested clean.

Vet is your best bet if you are really worried but if bun is getting plenty of timothy hay and water I bet it's fine.