Trying to eat my hand?!

[JRLongton]

So I got this new-to-me corn snake. She's actually four and lived with a breeder previously. I have her in this spacious terrarium with lots of hides and climbing branches.

Anyway, she's done this strange thing a few times. We just started handling her and she will kind of open her mouth and press her face into my palm, almost like she is trying to eat my hand. Both times she has done this she has bitten somebody (never me, Hahahahaha) and seemed high strung. On "normal" days she seems pretty chill and doesn't do the mouth open thing.

I can see that snake-keeping is a practice, and I'm but a novice. I'd like to know what the community things. Thanks!