I always took it that she was referring to the bars - in fact, given her use of "them" and the fact that the only other object she's referred to (the cage) is singular, it looks like the bars are the only candidate. I don't think she's thinking at that moment about other women and their situations, only her own - which she thinks is to be stuck in a cage until she gets so old and worn out that she loses strength and inclination to escape.
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Father, dear Father, if you see fit, We'll send my love to college for one year yet
Tie blue ribbons all about his head, To let the ladies know that he's married.
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