She does show flashes of heroism, even on minor levels - saving Gendry by saying they'd killed the owner of the bull helm, saving Jaqen and the other 2 when they were trapped in the burning cage, taking Gendry and Hot Pie with her for her escape, and so on.
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James - Board 8's Resident Warm And Safe, Slipper-Wearing User
& The Cream of Porcupine Tree Fanboyism