The academic advisor can probably help her sort it all out and figure out if this really is a case of gender bias or if there's something she's not seeing. Personally, I think she's jumping the gun on this and should seek some advice from someone who knows the situation and the hiring history and circumstances a little better before she goes and makes gender bias accusations.
A classmate of the opposite sex and I applied for entry level positions at the same firm senior year. I was offered $5000/year more than him even though we had the same experience level, same educational background, and would be doing the exact same work. The difference? When asked about salary expectations in the interview, I gave a number $5000 higher than him. I also had a slightly higher GPA.
Gender bias is a very serious accusation. This student better really consider the whole situation carefully before she says anything to the company she's interning with.