Need a good gallery plugin

I am moving my previously HTML only site over to wordpress, and need something easy enough for my mother to easily change and edit (plugin wise, not so much layout). I have been using galleriffic for a while now (https://www.twospy.com/galleriffic/), and would use it in my site this time, but it seems not to work on WP 3.5 or 3.4.2, so I need to look for something else. So far photospace 2 and Portfolio Slideshow have been the closest fits.

Unfortunately, my mother wants it to be rather specific
1. It has to have thumbnails, that when hovered over (or clicked on), change a main image on the page. (My current example is corinneslusserfineart.com/gallery.html, if any of you want to see what my final idea should look like)

2. It cannot have a lightbox or any other type of “popup” windows

3. It would be nice to have link actions, so when you click on a thumbnail or the main picture, you go to a page with that picture (links only on the thumbnails or main image are fine, I dont need both)

4. I need to have images be pulled from an external source (facebook, flickr, etc), or use wordpress 3.5’s ability to add images into a gallery from the media library, without having to take down and rebuild the entire gallery) This one is very important.

I would prefer a free plugin, but I have been looking for a while on this so I wouldnt mind spending a few $$
Also, sorry for all the requirements. Buts its for my mum so I hope you can help. Anything would be greatly appreciated.