L.C.
Don't worry about what other caregivers do, unless you have standards for your daughter's care that you think they aren't going to live up to. Then, you have a completely other problem.
What kids will do with strangers they have no reason to trust is very, very different than what they need and what they will expect from their parents.
Be assured... rocking a child to sleep is a simple pleasure for everyone that hurts no one in any way and you will miss it before you know it's gone. My very clingy 'baby' is now 16, and she has a great deal of independence and has absolutely NO interest in being anywhere near me when she falls asleep.
Don't hurry your baby out of babyhood. She'll be an adult for a lot longer than you'll be the mother of an infant.