Snakes can't cough...
I agree with Salamander, it could be some small thing like an irritation, but keep an eye on her for sure. If temps are within range then she will definitely have digested her meal by now, so there's no chance she was regurgitating. I have heard of some types of parasites causing dry heaving in snakes, but hopefully that's not what's going on.
If she seems fine now though, I don't think you have to be too worried? It's tough to tell, sometimes they just like to scare us with strange behaviors.
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