My current line manager was asked to step up for a 12 month maternity period. She's not coping with the pressure terribly well and frequently deals with this by getting very tearful in meetings, slamming things around and raising her voice. I went to her yesterday to help me with a significant work issue but the meeting ended up with her crying and complaining about how stressed she is. She has shown this kind of behaviour to most of the team now, not just her direct reports so team morale isn't great.
She is supposed to be in post until November and I have no idea whether to try and get her to see how she's coming across (she has told me she is an excellent manager so I don't think she has much self awareness) or whether to have a chat with her line manager to make her aware of how much she is struggling (this doesn't feel like the right thing to do, if it doesn't go right the working relationship could be ruined).
The rest of the team can't really take any more work off her as we are all totally maxed out.
Any ideas??