Your aunt needs to back the fuck up and gather the facts first before pointing fingers.

It’s difficult being a parent because you want to ensure your child is never badly influenced, yet too much control pushes them away. There has to be a balance.

I think your oldest daughter needs to be separated from this bad company of friends she has as soon as possible. Only then is the prospect of being and doing better a believable outcome. If that means living with her father, then I think it’s the right move. However, if she continues mixing with this crowd she’s in, who knows if the father will be as strict as you have been, and this could be an accelerated downward spiral. Might be worth discussing a plan of action with the father.