Lyndsey "Lyndz" Collins (Basia A'Hern) is a member of the first generation of The Sleepover Club.
As Rosie, she is originally from England and she is considered to be most laid back member of the group. Lyndz is fond of animals. When she is older, she wants to have a horse riding school and breed thoroughbred horses.
She has a twin brother, Michael (one of the M&M's) and she also has an older brother, Tom whom Rosie has a crush on. Her favorite color is green.
Lyndz is tall with short brown hair and blue eyes. She is always kind, caring and tries her best to fit in. Although there is a constant rivalry between the SOC's and the M&M's, it's obvious that Lyndz and Michael care for each other at all times.
- Father: Mr. Collins
- Mother: Mrs. Collins
- Older Brother: Tom Collins
- Twin Brother: Michael Collins (A member of the M&Ms)
- Grandmother: Grandmom Collins
She appeared in all of the episodes of the first series of the Sleepover Club.
The episodes in which she acts as a narrator are:
- Scary Movie
- Happy Birthday Rosie
- Agony Aunt
- Greek Sleepover
- End of an Era