BALLSTON SPA, N.Y. — An upstate New York woman has acknowledged she was under the influence of prescription drugs when she caused the crash that killed her daughter.

Alison Pecor, of Corinth, pleaded guilty to first-degree vehicular manslaughter and vehicular assault Monday. The 21-year-old faces up to 12 years in prison.

Pecor’s 18-month-old daughter was not properly buckled in when she struck another car head-on while travelling on State Route 9N in Hadley in February. The child died at a hospital days after the crash, and the woman Pecor his was seriously injured.

Pecor says she had taken Valium and Xanax before the crash.

Sentencing is scheduled for September.