After a family friend of her dies unexpectedly of cancer, a nanny’s life goes on a downward spiral struggles with alcoholism while raising a young girl whom she adopted.

I revised it.

As Richiev said. It's not clear what the plot is.

Also, it goes without saying that a character's life changes forever during course of a film story. So it need not be said in a logline--it's a hackneyed cliche. Loglines are about *how* a character's life changes, not that it changes.

Did not understand the purpose of the nanny. Is the young girl daughter of family friend for whom the nanny wants to protect and bring up as a good citizen?
Also did not understand the conflict .. does the adopted girl not like the nanny or are there any other external challenges?
Mostly did not understand the connection between death of a family friend and the adopted young girl if there is any.