Who is Jenny Masterson from Practical Demonkeeping: A Comedy of Horrors and what is their importance?

Jenny is recently separated from Robert Masterson. She works as a waitress in H.P.'s Cafe. When Travis sees Jenny, he is strangely attracted to her. They go on a date and share an intimate night together. Later, Travis discovers Jenny is the granddaughter of Amanda Elliot, a woman he fell for on a train years ago.