You can't help ease tensions between your DD and your OP.
You can continue to respect the feelings of your daughter.
Your daughter is entitled to feel as she does. You are entitled to consider rebuilding your marriage.
The person who can ultimately solve this is your H. It will take a long time, he will need to show her he intends to make this work. She will need to see daily acts of kindness, consistent loving behaviour to the family he so badly let down.
He must grow up, treat her with respect and listen and acknowledge that he caused this.
It will take a long time, she may never forgive him, that's the price he may have to pay.
Hopefully, if he man's up, she may move on. She thinks you deserve better, and you probably do. But it's your decision. Nothing can be swept under the carpet, it can be improved, but you need to be certain that he will have the patience and determination to prove to her that he deserves another chance.
Are you certain that he can commit to this?