I would advise her to think about applying and interviewing for a summer job (or a job in the real world) that she may want with a piercing in her tongue.
It may not be a big deal to some folks but others may percieve it differently.
I worked as a temp in an office where we were constantly on the phone. One woman was very difficult to understand and I didn't know why. I thought she had a speech impediment. She had her tongue pierced.