So per your previous post, about your Ex's Bossy New Girlfriend, your daughter's behavioral problems... started when the new bossy girlfriend came into the picture.
It is BADLY affecting your daughter.
And when your daughter visit's her Dad, who knows... how his Girlfriend is treating your daughter and you do not know what this woman is saying to your daughter on a regular basis.
Being that, the new Bossy Girlfriend's entry into your daughter's life, has seemingly caused emotional problems in your daughter... I would really, do something about it. It seems like a bad environment for your daughter to be in, when she visits her Dad.
What does your custody and visitation papers say????
You need to also, tell the Teacher about how your daughter has problems, perhaps because of this. So that, your Teacher is informed about your daughter's family life because it is affecting her.
A young child like that, CANNOT cope or handle, all these things by themselves.
Do you know how your daughter is being treated when she visits her Dad????? I would hope that her Dad, is nice to her and the Girlfriend and that she is not treated like a 2nd class citizen when she is there.
Or that, your Ex does not allow, his bossy new Girlfriend, to control... your daughter. Inappropriately.
There are so many things, that is causing your daughter to act out.
Can the School Counselor, also help????
Your Daughter, probably needs a professional Therapist.
Things like this, needs to be problem solved... and improved, otherwise, your daughter's emotional health will be permanently affected as she gets older. Think about that.
Your daughter is exhibiting trouble, emotionally.
And it is up to the adults/parents... to make sure she is helped.
She is so young.
How close are you to your daughter?
Do you chat with her, let her express her feelings to you, are you bonded well with her? A child, needs to have at least ONE parent, that they can rely on and trust and you as the Mom can be her soft place to fall... whenever she is stressed or worried or has anxiety or problems.
Because, it seems she cannot rely on her Dad nor his bossy new girlfriend who seems to be making things hard, on your daughter.