Based on the information provided, it is unclear why Wendy's trip back to Dallas would have cost her over $7000.00. It's possible that there were unexpected expenses during the trip, such as car repairs or lodging costs, but without more information it's difficult to say for sure. It's also worth noting that the cost of living and travel expenses can vary greatly depending on individual circumstances and location, so it's possible that the cost for Wendy's trip back to Dallas was unusually high for her specific situation.