An Illinois woman is facing sexual assault charges after she allegedly had a baby with her daughter’s 14-year-old date to a school dance.

Robyn Polston, 43, was detained on Nov. 3 following accusations that she had a baby in January with her teen daughter’s friend.

The Washington Police Department received a tip about the relationship after she gave birth.

Soon after, investigators obtained a copy of the baby’s birth certificate, which showed Polston had given the newborn the exact middle and last name as the alleged victim, according to a probable cause affidavit, per People .

Polston told investigators the father was “a man in his 20s named Brian,” but she claimed he was long gone before she had given birth.

However, DNA samples from the mother, the alleged victim and the baby c

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