Can magic and mortality survive once they become entangled?

The Sea Nymph:

When Merrow Havfine gets pulled through a portal along with two of her sisters, she finds herself entangled in the net of a fishing ship. As one of the eldest of her fifty sea nymph sisters, she is responsible for their safety. All she wants is to find them and go back through the portal before her father, Nereus, God of the Sea, discovers theyve disobeyed his rules. But when a handsome mortal king decides to keep her as his prisoner instead of throwing her back into the sea, she must do whatever it takes to convince him to let her go.