Aphmau would 100% leave her diary wide opened in a very visible spot of the house.
I imagine she sometimes leaves it on a page with Laurance or Garroth's name on it and they have to do their best not to snoop because, on one hand, "what does Aphmau think of me? Is it possible she might ever feel the same?" but also "I can't look at Lady Aphmau's journal! I am her guard! She trusts me!!"
Garroth chooses the latter nearly every time (for plot reasons he might not one time, who knows 👻). Maybe, he's trying his best to cope after Lilian did the hologram thingy and then he catches sight of Laurance's name and can't help but run away or something.
Laurance teases her about it at least once but never fully pries (he already understands this love is forever one-sided). He also notes how she's spells his name wrong 66% of the time. Maybe he finds her diary when he's blind and gets sad that he can't tease her about it anymore.
At one point, Zoey finds the page opened to something really depressing about how stressful being a mother and lord is or how she was never meant for a full blown war between kingdoms twice their size, etc etc. And Zoey comforts her about it (after apologizing for reading it, of course, something the other two didn't do).
