Gailee, I am so sorry. You must be beside yourself.
If SS are preventing your daughter from coming home, then they think your daughter is at serious risk of harm. They are not treating this like a single one-off incident. :(
This doesn't mean your daughter has been abused, but it does mean they think there is a serious risk that she could have been, and she might be again.
It doesn't necessarily mean they think you are harming her, but it does mean that they are not sure you can keep her safe. For instance, it might mean they think there could be another adult harming her, but you are not able to protect her - perhaps because you don't know or because you are too scared of that other person to stop them.
This is the time to think hard. Is there another adult who could be hurting your daughter? You haven't mentioned anything about your daughter's father or your partner/husband/boyfriend...? Or is there a grandparent or other carer who spends time with her alone? These are really horrible questions, and I'm sorry to be so blunt :( If someone else is hurting your daughter, it could explain why she is angry with you: she could be blaming you because you are not stopping it.
Of course it is still possible that your daughter has made it all up, and SS and the police will be aware of this too. But legally they have to investigate.
There are some
useful FAQs here that will tell you more about what to expect (The web pages are from a London authority, but child protection is similar all round the UK).
Have you phoned anyone yet, or got any support for yourself? I think that's really, really important now.