Rabbits’ pee can come out in an array of weird colors, so it could be normal. Did she recently eat carrots or radicchio (or any other red/orange colored foods)?

Usually blood in urine presents as clotted spots or streaks and not all of the urine being red. As Muchelle mentioned red urine in rabbits is quite common from certain vegetables and leafy greens

If you hit the urine with a paper towel, or have muffin/munch pee on a towel, you can see how it dries. Some times, Wick’s dark orange pee will look a little red, but if it’s blood, the pee stain color will be brown/red, instead of orange. Wick’s always dries orange, so that’s how I check. Also, I suspect the odor of bloody urine is different, though that’s a wild assumption with no personal experience.