This does sound like an agonising dream and it could be to do with anxieties that you might have deep down about separating from your daughter.
Perhaps she has recently started school or a new phase in her life where she is becoming more independent and whether consciously or not, you are struggling to accept this new development.
Another interpretation may not centre on your daughter at all. As you probably know sometimes our dream characters are just symbols of other people or issues. So your dream daughter may represent someone else in your waking life. She may be the vessel through which your worries are being expressed - so that you may be worried about some other separation in your life.
This might be leaving a job, an older relative may be leaving you or may not be being cared for properly, you might be worried about your own separation from another loved one and the feeling of guilt might be to do with that.
I hope this makes sense so that you can work out what would make you feel better.
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