I’m not the bloody one who did it to her!
In the kindest way possible, while you may not be the one who did it to her, in adopting her you signed up to help her through the hurt and harm caused by others. Which means trying to meet her need for a safe adult, which for her means she needs you close. I know that’s hard - I spent the best part of a year with two older kids who needed to be physically attached to me at all times - it’s so very difficult but it’s what they needed. They’re both much more secure now and life is easier but at that time they were terrified and needed safety.
I’d echo the advice to just let her be with you, once she feels more secure she’ll naturally adapt to others, start to explore her world and the people in it. That may take some time, your DH can help by spending time with your other child, helping them adjust to a new sibling, carrying the burden of household tasks etc while you help your little one heal.
If you consider from your child’s perspective in two years she’s been removed from birth parents (having experienced whatever adversity causes her to be removed in the first place), she’s then gone to foster care with people she doesn’t know providing very close care, once she’s felt remotely secure there, she gets moved to another family where she knows no one and has to adapt again to a new home, new people, new routine. It feels, looks, smells and sounds strange, she has a new sibling, new mum and dad - but that’s happened to her before and has changed, so who can she trust.
If someone took you away from everyone and everything you knew, put you with strangers and told you this is your family now, you need to find your place, as an adult with all your knowledge, resources and mature processing capacity, you’d really struggle, you’d probably be miserable, cry all the time, resist attempts to connect with strangers. As adults who chose this situation you and your DH are struggling - which is understandable because it’s very hard - but don’t seem to recognise that she, at a much younger age, will really struggle and need her parents help to cope. Instead her dad hates her because she’s miserable. You’d be miserable too in her position.
She’s a two year old child, without your resources or any power to influence or change what’s happened to her, and no capacity to process, make sense of it or even verbalise how she’s feeling. She needs care, empathy, acceptance, predictability and a sense of safety, and love in action.
You need somewhere you can take your frustrations and fears, support from your husband, so you can give this child what she needs.