You have to be very careful with collars because as you can see, they sometimes get caught in their mouths. Someone here had one of their kitties die because it was caught in its collar and she was at work and didn't get home in time.

An option to the collar is to get a micro-chip put in Maggie. A vet would do it, and all your information is on the chip. If she should happen to get out, the people who find her would have her scanned, they would see your information and get her back home to you.