It’s important to notice the indications of your girlfriend. The blood in her urine could be from a urinary tract infection (UTI). These involve painful sensation or burning during urination, frequent urge to urinate even when passing little amounts, and sometimes lower abdominal pains. She might require antibiotics to treat the UTI. Let her drink plenty of water and ensure she goes to the toilet whenever she feels like doing so. Advise her to have enough rest without holding urine for long periods. To receive the correct treatment, it would be best if she gets checked by a gynecologist.