Yes there is a fiqh of minorities that applies in the West so not all rulings from 'back home' applies here:
It is not unlawful for a woman to work, whether she needs to work or chooses to do so. You have already outlined the conditions under which it is permissible for a woman to work:
1. The work is halal.
2. The environment is safe.
3. She observes Islamic etiquette.
Those who say that it is unlawful for women to work outside the home may be taking that position in recognition of certain forces or anxieties specific to that culture.
http://seekershub.org/ans-blog/2010...r-me-to-work-even-if-i-observe-proper-limits/
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Islamic teachings are applied to all Muslims equally regardless of which part of the world they live in. Islamic teachings aren't subjected to specific culture or society.
I don't have any evidence/precedent from seerah of prophet :saws: or seerah of sahaba :ra: that they ever permitted or encouraged their wives to work outside of their homes.
Is the husband not able to earn money to give a comfortable life to his family..?
Then what's the need of seeking any leeway for wife to work with non mehram...?
However, in gyneocolgy Muslim female doctors are required. Reason is obvious and self explanatory.