Wow, thanks! If that's the case, I may have her attempt it with my last gen iPad. She has an iPhone 6 that can be very temperamental and is kind of on its last legs. Mine is an iPhone 11 Pro and I get very good service in the parks with Verizon as long as I'm not in those "dead spots" where nobody gets service. The iPad usually gets left in the room safe but hopefully it'll help.
I wouldn't count out that iPhone 6, when I went to the ride opening as Disneyland, both days it was my older iPhone 7 that was successful at getting a the red button (and then a BG) over newer phones.
You could still try the iPad also... I'd try from home first and see how that seems. I was working two phones, I wouldn't recommend more than two devices though as you lose focus.