First off, welcome....
At least for a while, until she is settled in and eating regularly, I would keep handling to a bare minimum. Your new snake is probably stressed. You've got 30 years to handle your snake, let her get settled. My rule of thumb is usually bare minimum handling until 3 consecutive feedings without refusal.
It's not unusual for your snake to hide for days on end, that's what snakes, especially BPs do. No need to worry there. They will hide for longer periods to digest or if a shed is coming. Still no need to worry.
As for the strike, sounds like a defensive strike to me. I usually only spot clean with the animal in the enclosure, but I make sure he/she knows it's me before I move anything around. For anything more than spot-cleaning poop/urates or changing the water dish out I will remove the snake and clean the enclosure while keeping the snake in a separate tub.
We're here if/when you have more questions.
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