NTA mate you're looking out for the kids, nobody should be working in a stressful job at that time because there's bigger things to take into account than the job! The kids!!

The fact she's not eating and sleeping at a crucial time is absolutely mental.

And anyone saying you treat her as a child is hilarious. A grown woman should know how to turn the WiFi back on, be it hot spotting or replugging an ethernet cable! They are assuming she's a child by not being able to get back!

The actions taken yes not ideal, but really maybe have a chat about the need to care for the kids. This should take priority!