I think the ghost is supposed to symbolize the lack of empathetic and compassionate men. When she says "But when I'm stuck in conversation with stuffed shirts whose adoration hurts my ears", she's saying that she's surrounded by men with over-inflated egos, and that the only man who is perfect for her is dead. That's another possibility too. That she's haunted by her dead lover or husband, who was the perfect man, and she can't find his equal.
I think the ghost is supposed to symbolize the lack of empathetic and compassionate men. When she says "But when I'm stuck in conversation with stuffed shirts whose adoration hurts my ears", she's saying that she's surrounded by men with over-inflated egos, and that the only man who is perfect for her is dead. That's another possibility too. That she's haunted by her dead lover or husband, who was the perfect man, and she can't find his equal.