I like it. Poor Lawry.

So like, she gets mad and tricks Lawrence into almost exorcising Barbara. He doesn't want Babs to double die, because he's not evil, so he agrees to marry her to make it stop

When she become human, she goes nuts and tries to leave the house to go take over the world or something

BJ stabs her with a broken hockey stick (IDK why he has so many hockey sticks) and kills her, making her newly dead

Once she's back as a ghost, BJ's crazy ass mom comes back. 

Lydia goes to BJ's defense because being alive, even for like five seconds, changed her perspective on life. and she doesn't want BJ to be sad and depressed anymore

Lydia opens a portal to the Netherworld and shoves his crazy mom inside, getting rid of her forever. 

Lydia then decides that she's caused enough trouble and should probably go back to the Netherworld to sort out her [i]own[/i] family issues

And maybe she comes back and visits in the epilogue and we see that BJ won the lottery or some shit and is doing great