In the real world, she was a movie queen. Once she rescued Celebi, who could travel through time and space and entered this world by mistake, and got along with her. Later, in order to protect Celebi, she tricked her into playing, but she didn't expect Celebi to come back halfway and saw those people shooting her and letting her fall into the cliff. From then on, Celebi hated humans because of her death.
She must not have died, but because Celebi saw her fall into the cliff and burst out with power, carrying her to the Pokémon world.
Purpose: The author is poor and wants to make some money