The Lotus Flower Champion by Pintip Dunn

No escape. Follow the rules. And don't count on reality-in this uniquely vibrant romantasy from NYT bestselling author Pintip Dunn and daughter Love Dunn...
It looks like paradise...only it's not.
This was supposed to be a once-in-a-lifetime family trip to Thailand. One last wish for my dying mama. Instead, we're stranded on a lush, stunning island with ten strangers-held captive as Thai mythology unfolds around us...and within us.
Now we're being tested. We're expected to face our greatest fears-and possible deaths-in hopes of awakening some kind of dormant gift...or curse. One by one, we're transforming, echoing the strange and sometimes wondrous abilities found in Thai folktales.
But my mama has only days to live, my papa is missing, and I'm forced to trust a group of strangers...including our evasive, dark-eyed tour guide, who resembles a minor god. Toss me in the ocean and feed me to the naga now.
Only I'm no hero. My days are managed by numbers and the compulsions that used to keep me safe.
I have to prove how far I can go. To survive. To protect my family.
And to find a way off this perilous island where everything is a lie...including reality.