Here’s another option. Contact The Village Aquatic Swim Team
https://www.usms.org/clubs/florida-a...swim-team-1213
They are masters swimmers (55 and up). I guarantee, most of them were high level swimmers when they were teenagers.
Explain the situation, they would probably welcome your granddaughter, train with her and give her feedback.
I know a lot of Master swimmers (not in TV) and all of them would welcome your granddaughter.