Shirley Sheep is Suzy's snobby and famous cousin. She's been on the cover of 4U Magazine and is the daughter of Star Sheep. She briefly attended playgroup until Peppa yelled at her for inviting her to Star's sheep-only concert, making Peppa believe Suzy is no longer her friend. This lead to Star Sheep getting suspended from her career for an unknown length.
The following is not canon as it takes place in a direct-to-DVD episode.
She was punished by being taken to Strangetown and getting her eyes plucked out, and then fed a lot of cake until she died.