Yes, you can squeeze a BP too hard. Skeletally they are basically a long series of ribs, which can be fragile.
Since you just got the snake 3 days ago you should be leaving the snake alone to settle in and acclimate. No handling at all.
I highly suggest following the 3 meal "rule". No handling at all until the animal has eaten 3 consecutive meals without refusal. So that means at LEAST 3 weeks. And unless the animal eats consistently without refusal, that means longer.
But, you'll want to check the snake for injuries...
So...take the snake out and put her on her back. If she rights herself quickly she's probably ok, just monitor the situation.
