Ready For It is pretty much a given, since it already has ties with Saturday Night Football and practically sounds like a hype song for large sports events. The Superbowl would be the one arena she'd be most focused on pandering to the broadest audience possible, so I feel like she'd probably throw the country audience a bone and play something from the debut. I can unfortunately definitely see her doing something like bringing out Tim McGraw for a Tim McGraw/Highway Don't Care duet. It would be an effective way of promoting the TS version of the debut at the very least nn.
If she were to do one of her ballads I think Wildest Dreams would be the most likely, maybe the great mashup with Enchanted she did on the 1989 tour.