The stable worker stabbed to death at Belmont Park – allegedly by an ex-boyfriend – believed he had moved out of state and she’d never have to see him again, the woman’s distraught daughter said Monday.

Andrea Hernandez Larin – a 27-year-old daughter of slain stablehand Maria Larin – said her mom felt safe from accused killer Jose Franco-Martinez, 53.

“He had threatened her before so she blocked him from her phone. They had broken up and were no longer together. He had moved to another state,” Larin told The Post in a telephone interview from El Salvador.

“She felt safe at work because she said security was tight and you needed an ID badge to get inside. So we want to know how he was capable of getting in? How did he slip through security?”

Maria Larin was tending to racehorse Our American Star following a 6:30 a.m. workout Sunday when she was allegedly attacked by the knife-wielding Franco-Martinez.

The horse bolted as Larin was attacked, drawing the attention of security guards who found the fatally wounded woman, officials said. Other stablehands grabbed Franco-Martinez and held him before cops arrived.

Andrea Larin said she can’t believe her mom is gone. They had spoken on the phone Saturday and had planned to chat again on Sunday.

“I spoke to my mom on Saturday night and we were supposed to speak on Sunday again but tomorrow never came,” the heartbroken daughter said. “Now I am worried about my mommy’s body being returned here. I want to see her and give her a proper final goodbye.”