Older Child Adopt-Do they ever really love you?

None of my bios talked to me that way and my older AD(who was 7 when placed) she does not talk like that BUT she lies she will look you right in the eyes (with you catching her doing it) and tell you nope I did not do it. She seems to have no love for anyone,not even herself. I wonder if she will ever be able to love anyone. That is one reason I really wanted to adopt only younger children,but we did not want to split up the sibs(4 of them). It has been battle after battle with her for the last 6 years, and it has not gotten better even with therapy. I wish you the best and hope you have better luck than us! I would not allow any child to talk to me with disrespect. I do not talk to them that way and they will ot talk to me that way. I would have a talk with her and let her know there will consequence(?)