On the contrary she seems to have abided it very well for some decades. Remember Tolkien himself says her 'life was not hatefully to her'. Eol's strictures about avoiding sunlight and her Noldo kin, admittedly unreasonable, were apparently distinctly less onerous to her than her brother's equally arbitrary demand that she never leave the narrow bounds of Gondolin.
Aredhel was apparently quite content until her son started working on her. Remember the running away was Maeglin's idea. If anybody felt imprisoned it was him - again not unreasonably. But it's quite clear that ambition for power and position play a big part in his desire to go to Gondolin.
Again not unreasonably. He's sister son to a King why shouldn't he want to enjoy some of the perks of that position? But as a motive it's certainly not as blameless as a simple desire for personal autonomy would have been.
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