If she loves school she probably won’t mind studying for the SSAT either. I am sure there are bunch of tutoring companies in Boston area that offer mock SSAT tests, which is a past version of the SSAT that they give under testing conditions with the same timing etc. It is worthwhile to do that to get a baseline of where she is at and which if any area she needs to work on. Then you can decide how to move forward with studying with a book, online or tutor if needed.