It's possible that her prey was a bit on the small side & she's looking for more...that's typical of snakes & most of us too& doesn't mean she really needs more.
It's better for a snake to eat a little less rather than a little too much anyway.
It may also mean she's just getting bolder as she's grown some & feels more settled in...and it may mean nothing at all. Don't worry about it...I really don't think
anything is "wrong". Snakes aren't robots, they sometimes want a little adventure too.