When we were friends

Lainey Carson and Sydney Beaumont were the closest of friends in high school, until popular Sydney leaves her contemplative, ungainly friend behind. Eighteen years later Sydney and her infant daughter come to Lainey's doorstep. Sydney tells her friend that she is escaping the child's abusive father. Lainey takes the child but then Sydney tells the news that the child has been kidnapped. Whom can Lainey trust?