What if the 'new' neighbor is part of 'whatever' Damon is involved in? We know Brenda, Damon, Denise, Barb said Danielle was home. They are all established liars.
The 'new' neighbor might be in on things also.
So, maybe Danielle wasn't home. Maybe she ran 'away' before Damon got home, while Brenda was out buying drugs (I mean Pizza).
I know, the boys. Well, no one has any proof the police ever asked the boys if Danielle was home that night.