Why didn't mattel make an "Isla" (PCS) Doll??? Are they racist??? :(

Zeke Norton (the director of the movie) said himself that usually, they make the merchandise before the movie itself is released. In this case, there was a slight change in the cast in the last minute, replacing Delancy with Isla. Since they've already made the toys based on the original plot, they didn't have time to add Isla.

And no, if you consider how Mattel always makes the Caucasian and AA versions of Barbie dolls, you'll notice they're not racist.

Hope this answers your question.