Hi, sunshine!
Glad you're reunited with your dog-buddy! With my own pooches, I've noticed that a change in food can easily mean a change in behaviour, and, as they adjust to that new food or routine, the behaviour improves, too.
Remember that, in a dog's mind, you were gone for a very long time. She loves you and she's super happy to see you, but she may still be suffering some lingering effects of separation anxiety. Try to be gentle and understanding with her, give her lots of extra one on one time, and try to get her outside for her business a bit more often than you're used to.
Here's hoping she gets back to normal super fast!
Hugs and butterflies,
~T~