I think my husband(her father) sexually abused my daughter...?

If this is genuine, which I find hard to believe, then I wonder why you were so unconcerned when your small daughter had bruises on her nipples and genitals. Why weren't you worried when your 3 year old daughter with bruised genitals started to hate her dad? Why your tiny daughter knew sexual things long before she reached puberty. It beggars belief, actually. In any case, it's your responsibility to tackle this, however late you are in realising it. Phone child services anonymously from outside your home, if you must. They have to investigate any allegation, so will ask questions without bias.