What's the Name of That Book??? discussion

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I Should Have Listened to Moon
SOLVED: Children's/YA
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SOLVED. Middle Grade novel. A girl has a library set up on the landing of her stairs and elastics holding up her socks. [s]
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I pulled up my socks. I pulled so hard that I popped my left elastic. ‘“Shucks!’’ I held the broken band and stared at my falling sock.
Lyon was missing a finger! On Lyon’s left hand, her little pinky was gone! Where there should have been a knuckle was an ugly stump that wiggled. I swallowed. “Uh, where’s your finger? I mean, what happened to your hand?”
(Lyon is her grandmother)

I thought it was called something like Landing Library, but I can't find anything like that.
There was a girl who was running? a library on the landing of her stairs, and had a weird best friend. The girl had a grandmother who was missing part of her pinkie finger from it being slammed in a door. The girl also wore produce elastics to hold up her socks. I think the cover was a girl from the waist down with her socks and elastics showing.
Any thoughts?