Julia Saker made the last-ditch attempt to prevent 19-year-old Tabitha leaving the family home to meet a dealer.
Saker and Tabitha’s ex-boyfriend Christopher Francklin – who saw the heroin addict climbing out of her bedroom window – taped her arms together and put a sock in her mouth, a court heard.
The pair were arrested after Tabitha dialled 999 and police heard her screaming at Saker and Francklin to “stop hurting” her and repeatedly claimed she “couldn’t breathe”.
At one point Tabitha managed to break free and grab a knife, but she was quickly disarmed.
A belt was also put round her neck and arms and tied behind her back – causing bruises and an injury to her jaw, Canterbury crown court was told.
Francklin, who is in his 20s, also jumped on her to try and restrain her. When police arrived at Saker’s home in Dover, Kent, last October they found Tabitha in tears and arrested her mum and ex-boyfriend, who both admitted false imprisonment.
Philip Hill, for Saker, said she had “done her utmost for Tabitha and acted with the best of intentions”.
Nicholas Jinks, for Francklin, added: “Things escalated. It was a short incident which caused great distress and he accepts his responsibility.
“There was no premeditation or weapons used and it was motivated by good intentions.”
Jailing Saker and Francklin, given 18 months, Judge Adele Williams told them: “You both detained a young woman who was subjected to violence and humiliation.
“It was said you, Julia Saker were at your wits’ end because of her drug taking but you could have sought professional help instead of imprisoning her.”