The movie you're thinking of is likely "Flightplan" (2005), starring Jodie Foster.
In this film, Kyle Pratt (Foster) is a grieving widow traveling with her young daughter, Julia, to Berlin. During the flight, Julia mysteriously disappears, and Kyle is accused of being delusional and making up the story.
The movie focuses on Kyle's desperate search for her daughter, battling disbelief from the flight crew and passengers while trying to uncover the truth behind Julia's disappearance.
"Flightplan" is a suspenseful thriller that keeps viewers on the edge of their seats as Kyle tries to prove she's not crazy and find her missing daughter.
