Okay wait so why did she agree to it

If she refused, they would kill her parents until she had no other choice but to agree to go.

also cuz she wants to keep her enemies close; she will be able to fuck with them while playing innocent and clueless while living under their roof

To my understanding, they will harass her family until they get away with her.
I just didn't understand why she accepted to be a concubine, for the gifts? It would not have change anything if she refused.