When you are there, get the name of the agency...and maybe Google them to see if you can find out anything about them.

If you are selected, you may be asked to put up money for professional photos, etc. But beware of being asked to pay for things you shouldn't.

If you can, contact a modelling agency via email or phone, or even contact a model you know for information. Though it sounds like your mom knows some stuff about this.

This IS exciting - just make sure it's legit, ok?