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Do you have a generator?
You can get a relatively inexpensive power inverter, hook to car battery & power her oxygen machine. (Best with deep cycle battery & don't run battery down.)
We have a sine wave we bought for $100 for this purpose. Runs fridge, tvs, lights, modem, router for hours (big deep cycle Optima car battery).
Quick easy fix. Might give you & Mom.some peace of mind to have a redundant power back-up. 
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