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She's hoarding because she's convinced that there will never be enough. Having suffered through a period of scarcity, she thinks that if only she can squirrel away enough resources, the family won't be in need again.
The LW might loosen his grip, too. He doesn't need to cut his own hair, much less the child's hair. And maybe all three of them can enjoy bed time and story time, rather than dividing that up so neatly. A little lavishness, a certain generosity of spirit and warmth might go a long way in getting the hoarder to come out from behind her piles of stuff.