It sounds like she’s asking you for help and you’re suggesting using a different tool rather than helping. If you keep repeating that it means she either doesn’t want to or has trouble doing it. Just take care of the tasks dude lol
Sometimes, "use a different tool" is in fact the correct and most helpful answer. If someone comes to me asking why they are having such a hard time pounding in nails, and I see they are using the handle of their screwdriver, I'm not going to give them tips on how to hold the screwdriver better, I'm going to say "dude use a hammer, you'll be much better off".
How is he able to help more other than telling the truth that phones and tablets can't do what she needs?
Okay, clean a 16000 email backlog on a phone.
On her phone.
Without her computer logged into her email.
Without her phone.
"I can do this for you, but I will need to use your computer to do it, and I will need you to read me off a bunch of 2FA codes in all likelihood, so you can either give me your phone or you can sit next to me while I do it. Oh, and they're your emails, so you may as well pull up a chair or I'm just going to have to guess whether you care or not."
My time is valuable too. You want me to do it, you help.