(Newser) – Rehab may not have done the trick for Demi Moore. Her behavior is reportedly still erratic and fears are rising that she's not staying sober—so her daughters are considering staging an intervention. "Demi’s girls are going to get help for their mom no matter what, but their relationship with her is so strained right now that it is hard to get anything done," a source tells Radar. "Rumer, Scout, and Tallulah are so concerned about their mom … They’re starting to wonder if she needs help again." Meanwhile, Scout has gotten in some trouble of her own…