What the lady is saying appears logical, what you are saying does not. Why would the Lord kill the guy for simply trying to steady the ark on a wagon? You’re saying God wanted the thing to fall off the wagon and get broken??
The guy wasn’t supposed to touch the ark, upon pain of death, those were God’s rules and plainly stated. It was HOLY, too HOLY to touch. It was supposed to be carried on poles, not in a wagon. Two rules broken. The guy touched it and got zapped when steadying on the cart. The next time they carried it with poles.
King David wasn’t too happy with the outcome.
I have seen this event offered as support for the perpetual virginity of Mary. Mary is the Ark of the New Covenant, equivalent of the Ark of the Old Covenant. She carried the same things in her womb as were carried in the old Ark. The word of God( the 10 Commandments/Jesus - the word made flesh); the Bread from god (Manna/Jesus - the bread of life); and a symbol of the priesthood ( Aaron's staff that budded/Jesus - the one true priest of God.) That no other man could touch the Ark without dieing, equates to the fact that Mary was a perpetual virgin. Also, David danced before the Ark when it was being brought to Jerusalem, like John the Baptist leapt in Elizabeth's womb in the presence of Jesus. The nature of the old Ark, "Gold within and without" is akin to Mary's sinless nature. You would not have Jesus, the son of God, carried in anything but a pristine (dare I say immaculate) vessel. All interesting foreshadowing of Jesus.