Out of curiosity how long have you tried going on for?
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I say this because DD used to FREAK OUT if DP and I cuddled in front of her. We tried everything - invite her in for hugs, including her, telling her to wait a few minutes, DP would be like, "Can it be my turn now?" or "Mama is your mama. She is not my mama. She's my sweetie and I like to hug her." I'd tell her, "I can choose who touches my body. I like daddy to hug me." She just wanted to hit him in the face and tell him, "No!". So then we tried a couple times of putting her down on the floor, "We are going to cuddle. You can cuddle with us or you can go play, but you may not hit daddy in the face."Â
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At first she would lay down and scream like she was being tortured. This would go on for some minutes, and we would watch her for a few minutes. Sometimes we'd invite her back for a cuddle, or go get her. Once, I got curious to see what would happen if we didn't. We said, "I love you," and then we didn't say anything else for a few minutes. Well, after a few minutes longer (and I'm talking just a few) than we'd normally wait to intervene, she would suddenly get up off the floor as fresh as daylight. I mean, it was like everything had run it's course. She'd get up and run off to play and be all happy and smiley. Not traumatized at all. But you'd think so for the first three minutes.
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I don't think she was faking it, but had learned that the intensity of that cry would cause us to stop doing what we were doing. Maybe seeing us hug was really unnerving for her so she would cry like that to stop the unnerving feeling. But I think once she got to experience that the unnerving feeling could pass, that she could experience seeing us cuddle and not stop us and the world would go on, it's been better for her. I'm not saying she never feels possessive about me anymore, but she seems better able to handle the idea that she can't control who touches me.
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So if playing the piano is really important and nourishing to you, and you haven't experimented yet, maybe experiment with how long she will cry for and if she can confront the feeling and see that it really will be okay? I think it's okay to do something that she doesn't like, especially if it's something that is good for your soul like being creative is. Even if it's just for a few minutes at a time and you build up. Not only okay, but I think it's probably good for your DD to see you engage with something creative.Â
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Your DD might be crying for the same reason that I suspect my DD cried at seeing me and DP cuddle: growing awareness that they are separate from us. And there's no way out of that but through.
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I do think you have to be sort of matter of fact, though. Yes, it's uncomfortable for you to hear mommy play, but mommy is going to play until the timer goes off in x minutes.  And you will be okay. You can cover your ears if you don't like the sound. I love you.  And then don't talk, but play.Â