When did the narrator begin her lifelong love of the theatre in the novel, Whereabouts?

The narrator's love for the theater stems from her father, who took her to see many shows there and who died on the eve of a trip the two were taking to go see a show. The narrator continues her father's tradition of patronizing the theater, although by the end of the novel she comes to realize that the theater represented for her father a kind of solitude in public, wherein his seat was solely his to occupy. Thus, the theater acts as a sort of liminal space between solitude and companionship, which draws the narrator to it.