sad office scenario for returning mgr?

Quite a few months ago, one of the managers in our small office tried to commit suicide and she hasn't been back to work since. Her return kept getting delayed by months and months. Now she's coming back on Monday and I'm not sure how to react. We were told by her boss to not even talk amongst ourselves about what I'm sure we all knew had happened.

I knew she wasn't happy because of the kinds of things she talked about over time, and complaining about even having to come to work (don't we all, I know). I've personally missed her because she was the only one here who could make me laugh, she's such a character, but I'm resentful because I could almost imagine her faking the attempt to get out of working (and she seems to have an attitude that she's above having to work for her money). So much has changed here at work in regards to policies and new practices, I think it will be even harder for her to cope. Her and her boss have been best buddies for decades and I'm not sure that her work ethic would pass the muster anywhere else in a mngt role.

Have any of you experienced anything like this scenario and did it work out for the person coming back?