There are 2 instances
First one:
Spoiler
Gemma is given a chip to control her body by the main villain, however Megan hacks into it, giving her the ability to pilot Gemma’s body. Later in the movie during a fight Gemma is knocked unconscious, but Megan uses her body to fight the remaining dolls like a puppet. At the very end we see Megan is able to speak using Gemma’s voice. Very brief all in all.
Second one:
Spoiler
AMELIA the other killer robot is made using code from Megan. While Megan is believed to be dead, they hack into Amelia and boot up Megan 1 in Amelias body for a very brief fight.
