She's either really happy or really scared. Have you tried handling her after/during one of these episodes? Her reaction to you attempting to handle her should show whether she's happy or scared. If she runs from your hand or bites, she's probably scared, if she plays or lets you handle her she's probably just getting over-excited.
If her tail is twitching, mice and rats do this when they are -very- upset. She might be having a problem with another rat in the cage with her, and you just don't see it happening. Or maybe there's a wild rat or mouse in the house, that she sees and you don't. Try separating her and see if the problem subsides. If she has a problem with her cagemates, that hould fix it. If she's just an aggressive rat, then she'll probably stay that way and keep acting out.
I just recently had to put a mouse down, who was doing this same thing. He was virtually unhandleable, and I thought it was because he was alone, and just on guard all the time from being a single mouse in a cage. So I moved him in with my elderly female ASFs and he was fine, until I cleaned the cage. Then he immediately started violently attacking the ASFs. I decided that was the last straw, because nobody is going to want a mouse for breeding, or a pet, that is that mean/scared/defensive. :/
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