I agree completely. If they'd merely wanted to change her last name I could have understood that, but to change her first name to Arlena? You can't erase a 14 year old child's psychological identity. How would you have liked to have been one of Kimberly's siblings who had mourned little Arlena, then have Regina and Ernest come home and say, "Here's Arlena"?
I don't think Regina's a bad person; however, I think she suffered severe emotional problems because of her belief (a belief which has some evidence to back it up) that Barbara Mays' parents arranged a switch in the hospital. She believed her child had been kidnapped and there was nothing she could do about it. Who among us could say we wouldn't have suffered? Also, in spite of the crass insensitivity of trying to change Kimberly's first name, I suspect that Regina was trying to fill an emotional hole caused by Arlena's death. She'd just lost a second child to a heart condition, and the rage over thinking her daughter was kidnapped filled the hole in her own heart.
I doubt you will see this but this is excellent and I agree with you totally. I feel awful for the Twiggs. But they shouldn’t have put Kimberly through that.