I think that question of "why do you all have so much time" is ok in my context. I always used it anyway in my chatting with friends.
It's true what..those can have time for their hobbies is truly a blessing and luxury if compared to those with small kids.
For me, if she is sensitive, you can ignore. Nothing much you can do to undo what you have said. Real friends will not bother about this type of trivial issues. :)
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