2 GB RAM.....meh, ideally do better (the more of this you have the faster running multiple programs will be, and opening and closing programs)
160 GB HDD.....again...meh, ideally do better (where everything is kept such as programs, documents, music, pictures, etc....the closet of the computer, so naturally, bigger is better)
Intel core 2 Duo T6600 processor....not any slower than that, but ok (the "engine" of the computer, so the faster the better. I googled this processor and it was 2.2 GHz, which is decent, mine is 2.26 and I wish I had a slightly faster one, but its good enough)
15.4" screen....totally up to her. personally i prefer smaller but doesn't matter, its personal choice (self explanatory, as is the rest)
DVD/CD Player and burner....standard (could do better, but no big deal)
4 year warranty....i'm too cheap for warranty's but i also do my own repairs and maintenance, so probably good for her (depending how good the warranty is)
bluetooth and webcam....standard, good
vista.....fail
acer.....fail
$900....fail (for what it is)