Definitely a urinary issue, but bloody urine is a BIG red flag, at least to me. I mean, come on, if YOU saw blood in your own urine, wouldn't you see a doc ASAP?
Not to scare you, but when I went to my e-vet, there was a woman there who came after me who complained of the same thing...blood in her cat's urine. A few hours later, I heard her crying in the bathroom she while talking to someone on the phone, saying her cat died after seeing some bloody urine for a couple of days.
A cat that eats kibble mostly as meals will never drink sufficient amounts of water, no matter how much you see them drinking at the water bowl/fountain. Cats that are seen to drink "a lot" will only consume about half the amount that's in canned food. Kibble has 10% moisture, while most canned has about 78%. Tell me that your cat drinks the remaining 68% from your bowl/fountain? Highly unlikely, and if they do, they are likely diabetic or have chronic kidney disease, which are also usually due to a kibble based diet.
Hope Sadie gets seen by a vet right away and you find a great solution to finding excellent quality WET food she likes. Some cats are more prone to urinary issues, so I wouldn't take a risk with any more dry food for Sadie, just my opinion, though.