How does her belly feel? Are the insides of her ears cold?
If her belly seems distended/hard, its not advisable to try and syringe feed her, because it could be a blockage.
If the insides of her ears feel cold, you should try to warm her. You can use a warm water bottle or a microwaved sock filled with rice (heat it with a glass of water to protect the microwave). Make sure she has room enough to move away from the heat source if she wants to. The safest way to warm up a bun is to sit her in your lap inside your t-shirt/sweater so your body heat warms her.
Do you think the blood you saw was from her uterus? As you know, rabbit urine can be very red. You can test if its really blood by dropping some hydrogen peroxide on it -if its blood, it will foam. (Jerseygirl who used to be a moderator here did this test with one of her buns that she knew had blood in his urine, and it did foam, a lot).
Have you seen any poop?