The nonverbal invitations were something Dinah was used to, given her history with Harry. He'd known too many things that could do horrible things if invited in. So she stepped inside when River moved aside to allow her to do so.
Of course, Dinah and Harry had been mostly on the outs by the time he took River on as his student, so she didn't know about the young woman's place in Harry's life. This was the first time she'd heard the name, so she offered a small smile. This would have been less awkward if Lindsey had explained things to River, but she didn't care about the social ease of the situation. She simply wanted to help.
"Ive encountered Poison Ivy before, and I know what she can do to people," she said gently. She didn't know if this was the best way to start but she thought explaining her reason for being here might be the best thing.
"If you don't mind, I'd like to ask you a few questions about your encounter with her."