Why are my photos taking up so much memory on my Moto X?

My wife had a Moto X, photos are taking up 6.8GB of memory. Yeah she takes a lot of photos. That being said how can I reduce the load? I wonder if some of the apps are duplicating the photos? I know that Google+ Auto Backup does not take up memory space for photos but Gallery is.

Any ideas for freeing up more space for her?
Can I delete the Gallery and run photos straight to the Google+ photo app?

Just trying to think up ideas to free up space so she stops getting alerts like this. I am on the Nexus 5 and I never have this issue.

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