I'd take a look at this one.
http://www.bestbuy.com/site/lenovo-...lack/8532575.p?id=1219345071697&skuId=8532575
Since she wants a larger screen and you mentioned a DVD player as a plus, this would fill both requirements and is under $500. Processor wise it will easily handle all of the uses you listed, as would any modern laptop. Lenovo makes good stuff in my experience.
http://www.bestbuy.com/site/lenovo-...lack/8532575.p?id=1219345071697&skuId=8532575
Since she wants a larger screen and you mentioned a DVD player as a plus, this would fill both requirements and is under $500. Processor wise it will easily handle all of the uses you listed, as would any modern laptop. Lenovo makes good stuff in my experience.