When did you bring this snake home? And when did she last eat? (date) For best results, no handling until after she's eating reliably (at least 3 times for you, without refusals unless in blue).
If she's been with you less than a week, it's too soon to feed her- snakes need time to settle in- new homes are scary, snakes don't understand where their familiar world disappeared to.
Waiting a week (or two, even) is fine before feeding a new snake.
Also, don't keep offering a stressed snake food. When they refuse, wait a week before offering again. Be patient!
IMPORTANT: BPs don't usually come out of their hides to eat. They're ambush predators & they like to eat after dark, by grabbing prey that just happens to walk by near where they're hiding. When hungry, they're often peeking out of their hide in the evening- they prefer dim lights & minimal activity on your part or nearby- try to blend in when you watch.
Feed a new snake the same as they were raised eating: live, if fed live, or pre-killed fresh or f/t (frozen thawed-) if they were raised on that; & feed rats or mice, the same as before, & try to get the same size for at least the first 3 feedings for best results. We can help you with tips to get her on f/t a bit later, when the time is right.
When snakes are "looking up", it's often because they're sniffing the fresh air coming in thru screen or vents. Try to relax- snakes need time to settle into new places.
What exactly is she eating? (big difference between rats or mice with eyes open or closed)