Zonfrillo died on April 30. In early May, Leong shared a tribute for her "work buddy and friend", saying it was "too raw to process".
In the months since, she has kept her grief private - and now she's explained why.
"I'm known as being someone who is pretty open about showing emotion in my work and as a human being. I'm not afraid of weighing in where I feel like I really am passionate about something," Leong told Stellar's Something To Talk About podcast.
"So I think there's been quite a disconnect in terms of, well, why is she remaining quiet at a time like this? I know a lot of people have been wondering that and so hopefully, for the first and last time, I can address it and we can move on from it."