Got a grad degree from Georgetown. It's expensive, DC is expensive, and especially the area around Georgetown is expensive. Flip side is that she's probably in the best place to be for a linguist since all of the embassy's are there as are all of the foreign policy/international think tanks/organizations. If that's her cup of tea, nothing beats being in DC. Also, Ivy league degree always looks nice to the prude elites.
I went to Georgetown over U of Florida for my Tax LLM, primarily because DC is the tax haven and Florida is a swamp. They are academically equal in Tax law (only NYU is better), but the 1 year in DC pretty much opened a multitude of doors for me that would have been harder to open from Florida. Still paying Georgetown off.
If that's not what she's gunning for, then she should save the tuition money and go somewhere cheaper with a good linguistics department. If she has a good GPA and some hustle, she can still nab summer internships. I'd pick whichever of Michigan or UMas gives the best financial benefit and/or has the better linguistics program. I hear that some state schools give money/scholarships/tuition discounts to out of state kids to go there. Not sure how accurate that is.
My cousin got into Georgetown and Ohio State. Went to Ohio State and studied finance because she didn't want to have to compete with the yuppy kids at Georgetown. Made straight A's. Had a summer internship in Madrid, and one at a big name investment bank in NYC. Got an offer from said bank. So it can work out.