Even better, you could not give her the RAM, go to
www.macsales.com , get a nice $30-40 for it, and buy yourself a cool Mac-related thing, because unless she's doing really serious and intensive stuff (i.e gaming in Boot Camp or heavy Photoshop/Soundbooth/Premier Pro/etc), nobody needs more than 2GB of RAM. I have 8GB of 1333MHz RAM in my Macbook and I barely go over half of that except when doing a full Time Machine backup, which notoriously sucks resources.