Try leaving the collar/harness and leash on her, let her get used to them. Make sure they're tight, though, to where she can't get her mouth around the collar/harness, otherwise she'll just chew it off. I've been through so many chewed harnesses. haha. As long as you can slip three fingers between the dog and the collar/harness, you should be fine, and she shouldn't be able to chew at it. That's how I got my dogs and cats used to collars and harnesses. Ever seen a cat try to walk in a harness for the first time ever? It's like they've got a hundred pound weight on their back, but not over their paws. XD