Actuaklly, I like the smell of nail polish. I always have. But I can see why it could be offensive in closed quarters. There might be an except made for nail polish even though it's inflamnmable, the exception probably applied to carrying it on board. Not everything you cab carry on board can be or should be used on board in public.

Sure, washlet is allowed. But you can't use it on your seat.

That said I am glad that this community of posters is not upset at OP's girl friend correcting someone. They could have said "If you want things your way, move", or "correcting someone is worse behaviour than the behaviour needing correction", or suggesting that the girl who was painting her fingernails complain to the airline staff and suggest that your girlfriend's liquor be cut off.