^Yeah, maybe.
Boston’s only, what, a 6 hour drive? If she’s scared to the point of needing to self-medicate then maybe she should just drive until she can fly once with someone.
Either way, back to the original post: No you can’t go to the gate with her, and she’ll be fine in Boston. The only difference about a big airport is that it can FEEL more intimidating and you need more time to find your way around. But again, everything is labeled and there are airport personell everywhere who can tell you how to get to your flight.