A woman who pressed a pillow over her ill mother's face and threatened to kill her during a holiday at Tenby's Kiln Park has been jailed.
Sian Williams, 41, shouted at her mother - who had recently suffered a heart attack: "There is an undertaker's over there. We will sort it out now and I will suffocate you."
Her mother, Dawn Wendy Williams, began gasping for air and thought she was suffering a second heart attack during the two-minute ordeal.
Williams admitted assault causing actual bodily harm and was jailed for six months by Judge Eleri Rees at Swansea crown court.
Huw Rees, prosecuting, said Mrs. Williams and her husband Ralph owned a caravan at Kiln Park.
On June 4 they won £60 at bingo and their daughter asked them to buy some alcohol for her.
Later that evening Williams started throwing a party for a group of holidaymakers and their children. Her parents asked them to keep the noise down and the others left in the early hours.
Williams began swearing and pushed her mother onto a bed and placed a pillow over her face. Williams sobbed in the dock as Mr. Rees related how Mrs. Williams felt she was blacking out as her daughter yelled: "I will put you out of your misery."
Eventually her husband managed to pull the pillow from their daughter, but she retaliated by shouting: "I will knife you. I will rip our guts out."
When she left the room her parents locked the door and called the police.
Williams's barrister, Dyfed Thomas, said his client had a drink problem and was full of remorse for what she had done.
Judge Rees told Williams the potential harm had been "enormous."
"It is most fortunate your mother did not suffer another heart attack. You have a drink problem but you are in denial," she added. Williams, from Porth, Rhondda, was jailed for six months.