IMHO, she's got enough power, but no real excess power, so the margin for error is less than it would be with a heavier bow. That puts a even greater than normal premium on making a really good shot.
I'd not want to try more than about 15 yards with that setup, but as with most things related to bow hunting, if you put a razor sharp broadhead in the right place you'll do fine; if you don't you won't.
Last, if she sees a 300# boar with that setup advise her to let him walk. A nice 150 or so will be a much better choice.