Patty is a full-time wheelchair user and wholly dependent on her only daughter Libby, or so she would have her believe.
Cunning, manipulative, and more than capable of looking after herself, she's used her apparent disability as an excuse, along with years of emotional blackmail, to keep a hold over Libby.
Unfortunately, Frank is in possession of this knowledge, having caught her standing up, and uses it to its fullest effect; namely a portion of her benefits allowance.
The ongoing saga of Patty's false disability led to a battle of wills between the pair; most notably him bending her toes painfully before flinging her out of her chair in full sight of the Jockey's customers.
Outed as a fraud, she tried to explain her controlling of her daughter's life but was met with no sympathy from the estate residents. Dejected and benefit-less, she left.
...only to return with a group of Christian missionaries. Of course.
When Frank accused her of faking her Christianity, and in a satisfying twist of karma, she responded by commanding God to strike her down if this be the truth. Moments later she slipped on a roller skate, fell and injured herself irreparably. She's now a genuine wheelchair user.
She can be a charming and affable lady to those she likes. She's sharp, intelligent and has more in common with Frank than she would ever care to admit.