That's true, she had the wrong priorities.I think Erynn did something wrong... She didn't go after the MC, she stayed to yell at Ethan. In two of the 3? perspectives we are sure to see Erynn didn't go after the MC. If someone hurts your friend you go after your friend you don't stay to yell at the asshole.
But... i think it's time to let it go.
Ps: I still think it's possible Erynn and Alexis split up to look for the MC, just happened that Alexis took the correct path.