Gwen is an obvious villian. Nothing Abby said warrants lying about her committing a crime to kill her/baby. When she lost the baby ahead of that fall.
Gwen tried to fake beaten up to get Abby arrested, when Gwen drugged her and tried to continue drugging her. She may get what she wants this time and is free to Jack and Chad. Gwen's for no excuses for her behaviour, she's a villain no different than Kristen.