Canceling a child's app subscription

My kid (10) has a few subscriptions that we're being billed for monthly. These are old apps she doesn't even use anymore. When I go to my subscriptions, all I see is my 2 or 3 items, when I grab her ipad at try to see her subscriptions, her name is grayed out and I can't go look. How on earth do I view/cancel my child's subscriptions?