Hello Ana, I speak spanish but it is not appropriate for me to do so in this english speaking forum, however if you need specific help you can send me a personal message and I will reply to you either in spanish or english.
Regarding your issue, you might want to go to Settings --> Apps --> All --> and scroll down to "Photo Editor" and clear its data and cache.
Alternative I recommend you to download the free Autodesk Pixlr app which is a great editor and you can fill it up with extra downloads and features, even if you don't, the simple "Adjustment" tools are still very powerfull. And the edited picture can be exported in its original resolution or smaller ones.
Good luck
