ipads are a BITCH to use if you're trying to post ads and send pictures.
If she isn't computer literate, then it'll be almost impossible. As it is right now, I can do VERY little on my ipad and even doing moderating stuff (for Eccie) on my ipad is a pain in the ass.
So I would highly recommend getting an ipad AFTER you've bought a regular laptop computer. You're going to have huge challenges taking care of your admin work on an ipad, even with a keyboard. Especially if you do a lot of cutting and pasting of texts ... it's an absolute bitch to get used to. (From MY female viewpoint, only, and this may not be that accurate!)
Sorry to override that advice you gave, Luv4Fun, with the ipad advice. I do agree with him, though, probably going to Best Buy is a better bet than Walmart. And everything else that he wrote was great.
I was just keeping things pretty simple with my thoughts above.