J.W.
Perhaps you should get her a book to figure out what type of forensic science she wants to do. Forensic is a process not an area. My favorite joke when I was studying forensic accounting was we take money from dead people. :p
Most affordable microscopes aren't that durable so as long as she takes care of it it shouldn't matter. Still there will probably be someone here who has bought one recently that could give you brands. We have a old microscope from when I was in grade school, has no bells or whistles but it does what it is supposed to do.
Oh, you may want to see if any of the schools are upgrading, then you can get a good one on the cheap. :)