I think you need to more devices than just the phone (e.g. Apple Watch, AirPods, a smart battery case, etc.) connected to see the battery widget. If all you have is the iPhone by itself, the battery widget is hidden. There wouldn’t be much point to having it since you can see your phone’s battery at all times anyway and that space in the widget list is probably better used for something else.
I think you need to more devices than just the phone (e.g. Apple Watch, AirPods, a smart battery case, etc.) connected to see the battery widget. If all you have is the iPhone by itself, the battery widget is hidden. There wouldn’t be much point to having it since you can see your phone’s battery at all times anyway and that space in the widget list is probably better used for something else.
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Does she have the Apple Pencil with her iPad? That’s what gets it to show on mine, and the widget stays even if the pencil is not connected at that particular moment.
MacDevil has it totally right. We had the same issue yesterday setting up my wife’s phone, and we found the answer somewhere. It appeared once we paired my AirPods with her phone.