There is a lot of good stuff happening. She is well beyond an average 10 y/o. No bat drag for a 10 y/o is rare.
One thing I notice, as she loads into her rear heel (that's good) she repositions her foot getting a little duck foot going on. I would like her to point rear foot slightly pigeon footed to help load glute and stop over counter rotation. She is over doing the staying behind the ball and leaning back a little too much. Some might say she is a little ABAF, too. All back, all forward.
You know what we were actively working on it when I recorded this, so it actually does look pretty good hereI wouldn’t change her stride foot. It is fine and not opening. The backside seems to be initiated first, causing what you’re calling opening. If the front foot leg was unwinding first and bleeding the coil and backside. Then yes, she on the other hand isn’t doing it wrong.