Andrea Brown was shocked to discover her daughter had married film producer Belafonte in June and believes she is suffering from postnatal depression.
Andrea says, "Melanie's not the sort to be taken in by anyone, but her hormones were all over the place after the baby. Maybe Stephen came along at just the right time and said all the right things.
"I need to speak to her, but she won't answer my calls because she knows what I'm going to say."
Last week, it emerged Belafonte has a criminal record for hitting the mother of his child, ex-partner Nicole Contreras.
Belafonte admitted attacking Contreras at her Beverly Hills home in May 2003 but escaped jail with a suspended sentence and probation.
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