The new mattress, while decompressing in the attic, evidently obstructed Bella’s access to one of her favorite chewy toys.
She responded by finding things on the nearby shelves to chew.
Happily, Bella appears to prefer destroying low-cost items. Miraculously, all the playing cards and concentration cards strewn across the mattress survived! Their boxes were damaged; she chewed the spine off a library book (not pictured); and that Nerf ball never had a chance.