Wow, what happened here?
Anyway, I am single with a 3.7 yr old DD, she is usd to having me all to herself and some days, this is just not enough.
Of course 3 year olds are wilfull, and know how to get a reaction. I am sure that this is all is happening with OP's little one.
I left ExH when DD was just over two years old, she was spiteful, hitting, spitting, kicking, because she just did not understand what had happened and this was the only way she knew how to react.
Once I had got over the emotional side of things when a marriage breaks down, I put my heart into making sure DD felt loved and had a happy upbringing.
She still has her moments, but has adjusted very well considering.
she does not feel threatended if one of my male friends comes over and is very chatty and shows off lol.
Different children, different reaction.
OP, you know your daughter best, so be it talking to her, special one to one time, or giving her something to look forward to, it helps in taking her focus off of the little battle she is having with you.