Leaving her collar on indoors while you can supervise her is fine. But when she's in her crate, or you can't supervise her, it is better that the collar is off. Pups do take a little while to get used to collars, but unfortunately they're also a choking hazard (including in the crate) - so it is best that it is only worn when you can keep an eye on her.
She will get used to it in time though. And once she's going out on walks etc, she'll soon come to associate the collar with fun stuff
