Final answer:
Bonnie and her friends rode the escalator to the Mezzanine level inside the ballpark.
Step-by-step explanation:
Once inside the ballpark, Bonnie and her friends rode the escalator to the Mezzanine level. The Mezzanine level is one of the several levels in a ballpark that can be accessed with stairs from the lobby. Typically, Mezzanine tickets tend to be cheaper than the main floor or the balcony.