In the DSLR range you could get a Canon Rebel T3 w/ lens. That is a body she can learn on and if she gets more into photography can get a few lenses then upgrade down the road.
Understand with any DSLR purchase that there is a steeper learning curve to working the camera. She will need to take some time and learn about aperture, shutter speed, ISO and exposure at a bare minimum and how to adjust them on the camera and how they all relate to photography. Also learning how to post-process pictures is important.
So many people get their nice new DSLR's then run to the photography forums bitching that their old point-and-shoot took better pictures than their new DSLR. It is really because they didn't bother to learn how to use the camera. DSLR's don't (necessarily) take nicer pictures than a point-and-shoot out of the box. That is because you have a plethora of settings on a DSLR you can play with and they take in so much more data you can get a photograph to look just the way you want it. But you do need to learn the camera and about photography to get the most out of the camera.
So if when you say "she wants to learn more about photography" she is interested in taking on those things, then the camera I mentioned above is a great introductory DSLR that falls into your price range. If by "easy to use" you mean that she wants the camera to do most of the leg-work for her, then I would look at a point-and-shoot and I like the Canon PowerShot line (yes I'm a Canon guy) but haven't really kept up on the technology so can't give you a specific recommendation.