I contacted them today and cancelled the reservation. The agent tried to give me a credit but I requested a refund, which she gave me. Thanks for the information.In the email from frontier, I clicked on the "view revised flight info". That took me to a page with new flight info & a link to accept changes. I did NOT click on that. Underneath was this line.... If you have concerns with your itinerary, please contact a Frontier Airlines reservations agent at 801-401-9005 and reference the above reservation code.
The agent offered a voucher or the option to get a refund. Like I said, it was easy! My daughter's flight change was under a 2 hour difference, but she also got refunded.