Does anyone know which episode(s) Paget Brewster was with in??

There were six episodes with her in season 4:

# The One with Joey's New Girlfriend
# The One with the Dirty Girl
# The One Where Chandler Crosses the Line
# The One with Chandler in a Box
# The One with Phoebe's Uterus
# The One with Rachel's Crush

You should see it, Kathy arc was amazing!