In the movie when she would be fighting with Harry (on his side) against the dark lord (voldeemot) her wand is different, I mean it seems like she is using beletrix lestrange's wand
Fast forward a bit and the kerfuffle that occurred at Malfoy Manor ended with Ron disarming Bellatrix. After Peter Pettigrew’s death, Ron took his wand, which he used to disarm Bellatrix. Harry, who had been using the Blackthorn wand given to him by Ron, physically disarms Malfoy and takes his wand. So all three now possess someone else's wand.
Harry -> Uses Draco’s
Hermione -> Uses Bellatrix’s
Ron -> Uses Pettigrew’s
This is what Google says