Why is my snake stressed out?

I got my first snake, a corn snake, 2 weeks ago. In all honestly I am a bit nervous handling her even though I know she cannot hurt me. The first week I had her she was great with me handling her but recently every time I pick her up she bites me or strikes and if I pick up the hide she’s under, she just darts away. I’ve looked up a million reasons why she could be stressed and I’m doing everything I’m told. Is she just a nippy baby or is something wrong?