Ropes.
She is on her high ropes. In a distant and haughty temper. The allusion is to a rope-dancer, who looks down on the spectators. The French say, Etre monté sur ses grands chevaux (to be on your high horse).
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.