I started describing the situation and then realized doing so is a breach of her privacy, so deleted my comment. I did have parental controls on it in terms of the apps she has access to, but had not limited the time spent (my mistake). I wish there was also a way to limit the number of pickups.
yeah, I have an app blocker on my iphone to block news websites/apps called Freedom. Essential these days to staying productive - although, don't think this app would work for your child, because it is not very reliable and needs to be restarted every few days.