Hello Again :)
That is so frustrating.
One big glaring thing about a hoarding situation is that it is all delayed decisions.
Just stuff it here for now and I'll get to it later.
But later never comes.
Maybe try telling her that it won't all fit into the storage unit in random sized boxes and bags.
That if it's put into bins on shelves it will all easily fit and things won't get smashed, broken, wet, fabric chewing bugs or rat and mouse chewed?
And that later if she wants to get something out of storage it will be more easily located.
That is a lie, but sometimes a small white lie is necessary.
Good luck with the latest road block.
Hope she sees how reasonable you are being.