I'm just replying with compassion as I'm sure it was very painful to have your daughter pass away.
It's possible that you smelled a strong bodily emission in the hospital which is natural during and after death. My mother vomited a long stream of thick foul liquid quite a while after she passed when someone from hospice moved her. The image and smell made an impression on me, as you can see.
My advice would be that it's best not to worry about what exactly caused it, whether anyone else was aware of it, etc. Whatever it was, your daughter was most likely unaware of it and is at peace.
Yours warmly, ~Laura