Where The Miracle Happens(2008)

Pimdao, a successful real estate developer and businesswoman, is injured in an accident that kills her beloved daughter at a time when the two are estranged. After the accident, Pimdao decides to take her daughter's place as a volunteer at an impoverished rural school in Chiang Rai, keeping her identity a secret. In the end, Pimdao, played by Princess Ubol Ratana herself, realizes that real happiness doesn't come from external events but lies in the heart.