Did some searching on Reddit and found this response from Jessica Moreno:

Hi everyone.

I did not make an announcement as I'm a really private person. I don't like attention and having the media involved is super uncomfortable : (

There is a transition in place. I am working with Spez and the new head of community as I leave. I don't want to announce the person since I'm not sure if they are ready yet. That will be it's own announcement. Re/code makes it sound like I left abruptly but I haven't.

My departure has to do with my own life outside of work and nothing internal at reddit. It has nothing to do with the policy changes or being a woman. The author couched facts between sentences meant to inspire speculation.

I have really loved being with reddit and I'm sad to go. Staying just doesn't work with the rest of my life right now.

I just want to clear up any speculation or misconceptions about this. I assure you that you will be in good hands after I leave. Better than my own, actually.