Good to know it's not cancer
You're right that breast exams need to be done more often, seeing as the earlier a lump is found the better the outcome will be. I myself give myself the weekly self test in the shower and have done so since i was 12. It was at that time that my Nanna had 2 cancerous lumps removed 1 from each breast.
I wish your girl the best of luck if she has the surgery to removed it.