Lydia the Mirror Gazing Mother is one of the ghost's that escaped imprisonment in Luigi's Mansion.
Lydia is the wife of Neville and mother of Chauncey, Orville and Henry. She seems to have a thing for looking in the mirror. The only way to attack Lydia is to open the nearby window and lure her over to it, then you can attack. Lydia is easy to catch and has no attack at all.