In the musical Meg Giry is the one who suggests to the theatre managers to put Christine in the leading role of the opera Hannibal once leading lady Carlotta Giudicelli is spooked by the Phantom's threats.
At the end of the musical, Meg finds the Phantom's mask that he had used to cover his disfigured face resting on his chair in his abandoned underground lair, suggesting a romance between the two, or at least a deep connection.