If she doesn't get it unstuck in about 5 minutes and doesn't seem to be making any progress, I would try and give her a hand. I know she'll be oh so happy about, but if you hold behind the head you should be able to remove it with some tweezers.

My new girl just went blue, and she was majorly cheesed off at me. She must have struck at me at least two or three times. I just misted a bit (as she's in a quarantine tank), and covered the majority of the tank, so she can have some quiet time. It's a major difference from the girl I removed from the bag who was pretty relaxed and didn't even hiss.