im not an expert, but assuming that you are a brit and on the NHS, i dont think so. but im sure your mum would rather know than not. you should tell her and get it sorted right away!
yes, your mom would be hurt if she did not know. It is most likely
an infection and a doctor can tell just with a urine sample and
you may not even need a scan. Most of the time the things we
worry about aren't as big as we think they are!
However a kidney infection ignored can make your petty sick and
cost your mom more worry and heartache in the long run!
Shelly