Ok, lets lay out your priorities. Your first priority is your daughter. You are her covering. He protection is your number one concern, or, it should be. The bible gives priority to the children. Here is what the bible says in Matthew 18
5 "Whoever receives one little child like this in My name receives Me. 6 " But whoever causes one of these little ones who believe in Me to sin, it would be better for him if a millstone were hung around his neck, and he were drowned in the depth of the sea.
and later it says..
10 " Take heed that you do not despise one of these little ones, for I say to you that in heaven their angels always see the face of My Father who is in heaven.
Read that and understand. You do not, do not want to stumble your daughter. You do not want her to have hatred, anger, pain, guilt, shame, perversion or any other hinderance because of your actions (or, in this case, lack of action). And, failure to protect her is being a bad steward.
I don't want to judge your actions. But, it must be said that covering this up was the wrong choice. We can't do anything about it now cause that is all in the past. What matters is what you are going to do today.
Are you going to protect what God has trusted you with? You have no excuse not to because you know of your husbands attack on her. And yes, that was an attack on her. And, it can destroy her.
Basically, your daughter needs you right now. Please, please be there for her. Your husband, well, to be blunt, you should report him. I know it will be a high price to pay. You may have to move out of your comfort zone but if you have any faith in God, you need to know that God will take care of you if you do the right thing.
And, not doing anything, is doing the wrong thing. May the Lord give you the strength through this.
led