I know when Dylan was around Emma's age, she could tell when I was stressed too. So, if you're getting frustrated and stressed then it's possible that Emma can sense that. I know that it's hard, trust me.
Try the frozen ring again, or even a frozen wash cloth for her to suck on. Try also rubbing your finger along her gums where the teeth are meant to come in, the slight bit of pressure actually relieves a bit of the pain.
If none of that works, then it might be time to take her to her pediatrician. They'll be able to give her a bit of tylenol in order to help.