Who is Melanie Gold from The Pact and what is their importance?

Melanie Gold is Emily's mother. Melanie is a quiet, reserved woman, almost the complete opposite of Gus. Melanie and Gus are close friends and raise their children together, causing Chris and Emily to be nearly inseparable. It is Gus and Melanie's hope that their children will eventually get married, making them a legal family. However, when Emily dies, everything changes for Melanie. Melanie is devastated by the loss of her child. Melanie ceases to function, and when she begins to recover, her entire behavior is changed. Melanie needs to blame someone for her daughter's death. When the police tell Melanie that they suspect Chris of murdering her daughter, Melanie seizes on this information and will not let it go.