Does Tonya’s phone support 5G? If not, perhaps it’s a 5G signal issue.
I’ve had my 15 Pro (Verizon) for less than two weeks. So far I haven’t noticed unusual drain, and there is nothing under no cellular coverage even for the last ten days, and that included time in rural Vermont and NH for the long weekend last week. But my summer house is in a cellular sink hole; I have a Verizon network extender there so it’s generally ok at the house, but go outdoors and my old 13 Pro simply suffered. I spent last summer with low power mode on almost all of the time just to get through the day.