According to IMDb, Jennifer Coyle is the sister in law to Thomas Perkins. I guess that explains how they ended up working together on DC Superhero Girls. She was a producer and director and he did character designs for at least the Legends Of Atlantis movie.
It's an interesting coincidence how there are 2 Barbie movies where Shannon Chan Kent voiced a character named Isla. Those two are Barbie Princess Charm School (which I didn't see) and Barbie Dolphin Magic (which I did see).
Barbie: Princess Adventure has a fun casting decision. Barbie's lookalike Princess Amelia is voiced by Erica Lindbeck when speaking and Jordyn Kane when singing. Both had been in other Barbie projects, with Erica being Barbie before America Young took over, and Jordyn doing her singing in various movies before Elli Moore took over.