Is Isabelle supposed to announce summer shells?

This is my first year playing AC and I saw in my app today that the summer shell crafting season has started, but there's no hint of that on my island. I'm sure the shells will eventually start to spawn but I was looking at the wiki and it looks like Isabelle is supposed to announce it and give you a diy? She did that for me for cherry blossom season. I have a new resident today (I found Bones!!!) so did that just stop her from giving me something because she announced that? Will she ever announce it? I see posts from the first year of the game asking similar questions but no resolution on if some people just don't get an announcement? I've never time traveled at all fwiw