Well S., the only thing I can tell you is when you start something like that, it's hard to break.
My mother did my oldest daughter the same way. She did not work, therefore she would keep my daughter while I was at work and would rock and hum her to sleep. Once I got home, of course, tired from working all day, she'd expect that from me.
Nevertheless, it had to be done...if it didn't she'd cry, cry, cry. So I would put her in her crib and pat her back until she fell asleep, or so I thought. Once I thought she was asleep and stopped, she'd start crying again. I had to eventually lay her in the bed next to me because as long as she felt my warmth next to her she was alright.
The only difference between my situation and your situation is that my daughter was not as old as yours is. I'd dare not let a child get that old and still have to rock her to sleep, unless of course, she's ill and just doesn't feel well.
You're moving a bit slow, S....it's gonna get harder and harder to break her.