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MADISON, Wis. – A mother is thanking a preschool teacher donating a kidney to save her 4-year-old daughter’s life.

Four-year-old Lyla was diagnosed with Microscopic Polyangiitis in October 2015. The disease can can cause organ damage. Her family has been waiting for months to find a kidney donor.

Earlier this month, teachers the Kids Express Leaning Center in Madison, Wisconsin planned the big surprise for mom Dena Carreyn, who showed up for a parent-teacher conference. She was sitting down with Lyla’s teacher when she got the good news.

A video posted to Facebook shows the touching moment. Beth Battista handed Carreyn a short letter that read, “I may just be her teacher now, but soon a little piece of me will be with Lyla forever. I’m Lyla’s kidney donor.”

Carryen immediately broke down in tears, hugging Battista and thanking her.

Watch the heartwarming  moment below: