I was confused by the ending. I don't get how she died.

yeah same here. It would be nice to know how she died, but I think it's significant in this way...

...we also never find out how the baby Tommie dies. I think Crane is suggesting that society doesn't care what happens to these people...

...by telling the reader that they die but not giving any details about their death suggests to me...

...that they are just a couple more impoverished lives that no one really cares about or who have no importance in society.

why is it that the women in these stories are all dying at the end?

I don't think the women in these novels died because they are women. I think they died for other reasons...

...Daisy died because she represented innocence. Her personality was pretty much the death of innocence...

...Edna died because she awakened from the role of a traditional wife of the time. She represents the death of the traditional housewife...

...I think Maggie's death is almost the death of a dream. She wants to get out of the slums but doesn't. She suffers the fate of so many...

I also noticed that they all died after going against some societal construct for the roles of women. They didn't fit the molds their time..

...period.

well, I would say Maggie did to an extent.

I thought that this haziness really pulled the ending of the piece together.