How old is your girl?
UTI is a bacterial infection in the urinary tract...females are more susceptible because our urinary tract is shorter and closer to the rectum...which is why when cleaning the genitals, you should wipe from front to back, to avoid bacteria from the rectum entering the UT. It can cause kidney damage, or there might be blockages, so tts why need to ultrasound. dont't worry, your
Keep your girl hydrated, so she can pee more to flush out the bacteria.
Also try not to use too many creams or soaps on her genitals that cam cause further irritation, water and cotton to clean is good enough.
Anyways, do take care