A Bronx mom celebrating her PhD graduation saw her day of joy turn to horror when she learned her teen daughter was struck in the face by a stray bullet.

“I was awarded during the ceremony and it was the biggest achievement of my life, you know, proving to people that in spite of everything, you do exist, and you can do it,” grieving mom Jennifer Talbot told The Post Sunday, one day after her 17-year-old daughter was critically wounded in Baychester.

“But a day for celebration became a day of my worst nightmare.” 4

Talbot’s daughter was one of five people shot in a gang-related burst of gunfire around 5:30 p.m. at a basketball tournament near Haffen Park in Baychester. A 32-year-old man died, and three others were wounded, police sources said.

Talbot said the teen had been upset

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