I don't understand why you thought replacing a 2010 machine was necessary. It's hardly old or out of date! Did you really have nothing else to spend your money on that a laptop that was clearly not needed?
The 2010 white MB is perfectly fine. I was only looking at changing it out because it's warranty is up in a few weeks and I've never had a MacBook of any type without warranty coverage on it. I don't want to pay the $250 for AppleCare on it, so I thought I'd sell the 2010 white MB and replace it with another laptop so I could gain another year of coverage going forward.
I wound up just selling the 11" Air and I think I'll just keep that white 2010 MB for her and roll the dice without the warranty since it seems to work just fine.