Based on the simple example you cited you are the wrongdoer, because you didn't read between the lines.
She was looking for empathy in that statement and instead of giving it to her you decided to minimise and create an argument were there was none.
Back home her mother, aunt and several relatives help her out so she can get good sleep and rest, but in the individualistic west they are alone despite being inherently weaker then those back home due to environment and upbringing.
Your expecting to much from her, if your unable to give her the weekends to recuperate, de-stress and rest, then find another solution to give her a break every weekend or help midweek, you need family to help out.
If this is the kind of incessant complaints your referring to then I hate to say it but
@VixR is right, disregard my previous post as it will only make things worse for you, because your problems are different and of your own making.
Don't expect a 21st century pampered diaspora female to have the same strong spirit and fortitude as you, there is a reason you are made stronger in every facet because your allowed 4.