Police investigating the incident do not believe alcohol was involved.
Friends and family, as well as staff and schoolmates from nearby Lake Fenton High gathered at the waterside on Monday for a candle-lit vigil for the tragic teen, releasing lanterns into the night sky, ABC12 reported.
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"When she comes in you just are happy. It's impossible not to be happy when you're around Lexi. She has the best smile," said one of her teachers, Andrea Brigitha, told the site.
"She literally is every teacher's dream." she said. "She loved to make videos for her family and friends... There's not a person that met Lexi that does not like Lexi."