in the movie scream,what scret was sidney's mom hiding?

[BleedingLove]

i don't get what sidney's mom was hiding only watched liked 30 minuets of it and i seen the 1st and 2nd one

 

[Clevernickname]

Sydney's mom is dead before Scream 1 starts. She is not hiding or hiding any secrets because she is dead.

However, she was having an affair with Sydney's boyfriend's dad, so Sydney's boyfriend kills the mom with his friend.

And in Scream 3: When she was younger and alive, she went to Hollywood to be an actress, she was r**ed, had an illegitimate son who she put up for adoption.