She's not a fan of revolvers, so those are pretty much out. What other brands and models do you all recommend?
That would have been useful info. BTW- Why does she not like revolvers? Sure, they may not be as "cool" as semi-autos, but they have many advantages. Is she planning on keeping this gun in her purse? If so, is she comfortable with the idea of having to pull the weapon completely out of a purse if she desires more than one reliable round? Also, is she comfortable with the idea of carrying a gun which has a round loaded in the chamber or rather, having to pull the weapon out and "racking" the slide in order to chamber such said round?
Im not flaming here or trying to discard semi-autos. I personally would carry a semi-auto if I had a conceal/carry. But, I would be using a holster. Will she? That does change the playing field a bit. If this gun will be going into her purse or handbag, it might be somewhat short-sighted to dismiss a revolver.
If she MUST have a semi-auto, Id suggest going with nothing more than a 4" barrel. I like Sigs or Springfield Armory.. depending on the caliber. A small Glock in 9mm might be good as well. Personally, Id go with a Sig...possibly the P239 (9mm). But, thats out of the price range you listed. For that price range, look at the Glocks or Springfield Armory XDs or XDms.
If going used, look at the Sigs. You just might find one within your price range. Either way, Id personally stick with the 9mm or .45 ACP calibers when dealing with semi-auto. The Sig P220 .45 ACP compacts are nice, but are currently having issues with the internal extractors. If you can find one used, with an external extractor, consider it. Otherwise, for .45 ACP, consider the Springfield Armory. Just my opinion.