neither is great.
but both could work.
The being bent up in the wardrobe wont so much stretch or damage her but but will likely cause compression and crease marks on the front of her hips.
If the Garage is dry and doesnt get silly cold or silly hot, then you may be ok with that option, but make sure she's padded so you can avoid her butt going flat if she's there for a long time.
Ottoman Beds can be a good option, but you have the added fun of manhandling a doll in and out of the storage space and that may be difficult.
HTH
K