My reasoning for this being A. Adonis: To start with it's a pink mycenoid mushroom of which there are three documented species in the PNW.
It can't be Mycena Monticola because it wasn't found at a high enough elevation for that species (they only grow at over 2000 feet hence the name Monticola meaning "mountain dwelling").
The gills are not marginate (having a different color on the edges) which rules out the other pink species Mycena Rosella.
That leaves us with A. Adonis.
