Y'see, she had started out as the same sort of 'meddling annoyance' Mira was only to have her own spoiled brat children turn on her. Rather than act like a sane person and cut her losses, Lovey decided to treat Mike and Deanna the same way she thought she should have treated her own teeming get and let them do whatever fool thing came into their stupid heads. Does Mike wanna drive down the property value by acting as if leases can be violated at a whim? Go ahead. It's cool. Does Deanna stand around mooing about how children have an evil need to run and move and play and speak when Mommy is tired. Wonderful. Lovey can join the Pattersons in chanting "TIME! NOT TOYS!" at a woman who provides both when Elly provides neither. Do they go out of their way to alienate and antagonize the child-free couple downstairs? Lovey can get behind that because childless couples are selfish vermin who should die in fires.
Since other property owners expect Mike to act like a grown man instead of a wide boy playing house with another jumped-up fourth grader, he could never find a place he loved until he found another invertebrate in love with his immaturity and stupidity: his pea-brained mother.