Hi there! I would say that if she isn't fussy until evening, I'd use the swing around that time to get a catnap. Tracy has always called the catnap a "freebie" which means you can use AP (since this is the first nap to go). I would be wary of using one for other naps because she may become accustomed to it and then it will be much harder to get her to sleep independently again.
HTH!