This sounds like a crappy relationship and unhealthy environment. Why have you intentionally chosen poorly??
Why would you pick a controlling abusive man like this for you and your children??
You have placed this man and this relationship over the welfare and well being of your children.
Why have you picked someone who is rebounding with you and have picked you because you seem to take anything?
Your daughter is feeling unloved, neglected, unheard, and not prioritized..Sounds depressed and stressed.
You have largely contributed to this.
She's not doing anything wrong by not wanting to participate and communicate.
Sending her away to her dad's (as if she is responsible for everything including the turmoil) but having his children over in her absence as if they're replacements..is absolutely horrendous.
Do you love and care for your daughter??
What makes this behavior seen as acceptable to you.
If you are financially struggling, why would you just chuck food in the bin instead of refrigerate/freeze it??
Someone will eat it..eventually.
Why did you pick a financially inadequate divorcee, who doesn't like nor care for your daughter, who is controlling abusive, who's pinning and feeling guilty over his leaving his ex wife??
You're going to perhaps regret your choices..when one or both of your children sever all ties with you.
If she is being treated with love, kindness, compassion, encouragement, being supported, heard, and her overall health and wellness improves at her father's....discuss her staying permanently or temporarily with him.
It's not her fault that you picked this guy. .
This is just terrible.