Hey Uncle Ben.
You can sorta' see where she is comming from. If you post these kind of comments, knowing how seriously JW's take themselves, you have to expect that they will take it as a personal put down. I think I might have...or at least I would have known you were making a jab at something I still valued.
If you had former co workers as facebook friends and posted a comment such as " Glad I was able to find a real job after working for a go nowhere company for so long" , your former co workers who still work there might be offended or at least feel worse about their jobs than they already do.
It seems like your Niece was reasonable though, she mentioned wanting to see you soon. If you haven't sent your reply already, I wouldn't. It might be best to simply say, " Oops....didn't mean to offend anyone, humor, in part is how I got myself through a difficult time period in my life"