What exactly is the problem? Your nice love the person who she spends 40 hrs a week with. She should. If she wasn’t bonded to them that would be a problem. We had a nanny and my dd loved her and talked about her all the time. Now at preschool she adores one teacher and always mentions if she was there that day. When dd is mad or upset she says “I want a different mommy”, “I want susies mommy, she’s nicer”. Of course she says this, she’s nearly 4 and smart and a little manipulative like all kids that age.
She also asked to go to grandma and grandpas house since they dote on her and play all sorts of thing with her that I don’t. I do not take it personally st all. At the end of the day she knows who her mother and father are and loves us.