The current situation, with Gwen being taken, and Sleeker on a quest to get her back...has given Sleeker a perfect opportunity. Set a death trap for Diane....who Sleeker despises,(see Sleeker one...when Dianne got Sleeker so mad , that Sleeker told Diane she'd kill her...Sleeker always tries to make good on her death threats.)
Sleeker doesn't want Diane with Brenda...and Sleeker wants her twin Brenda working with her. ...in the Sleeker girls...doing evil. NOT with goody-goody Diane. Sleekers plan is to eventually have ALL of her sisters ,and her brother with her.