if she needs just a speedy response kind of build, go with a sandy bridge processor. if she needs a tiny bit more graphical power at the cost of cpu effecientcy, take a A series amd apu. though from what it sounds like, a sandy bridge processor will fit the need better
An AMD A4-3300 and an ASUS F1A55-M LX will cost 122$ with free shipping. Add some 25$ ddr3 PC3-1600 ram with free shipping and you'll have a nice for 160$. And add some flowers and chocolate with the remaining money for mother's day and that will make her happier that with a 225$ computer for sure!