They may take a while to swallow, but they should get through it. How long did you wait before interfering? Actually, checking which plane you're talking about, you should not have had to cut at all. They know what they can swallow and won't kill something too large and if they can eat the first half, they can eat the second.
They don't always move the jaws together and they are actually very flexible. Did you take the mouse out of her mouse to cut? Was she moving her jaws right then left while trying to eat the mouse? That's how they get them down.
Substrate in the mouth is 99.99% of the time not a problem. You can check if you think some might be stuck in there, but they can pass some really big (food size) chunks w/o problem.
The thing that worries me is the "rapid trembling" and "contorting". Was the contorting just to position the mouse maybe? That would be normal. Most of this could be normal except for the trembling and if the jaw adjusting did go on for a long while after she swallowed.
I really think you should have just stayed away and let her eat her mouse.
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