i feel like there's 2 main reasons that dustin still attempts to lie to suzie about everything that goes on in hawkins: 1) the less she knows, the better. she doesn't live there, so she's safe and it isn't on a need-to-know. and 2) once he shares it with her, he knows it punches holes in certain things that she believes in and doesn't want to be the one to do that. also a bonus reason, 3) the duffers are shitty to dustin and gave him a long distance gf so they didn't really have to spend time developing the storyline. BUT ANYWAY, suzie is clearly not stupid and they've needed her help for things that come with shitty lies that make no sense, so she KNOWS something is up. she doesn't know what, but she becomes skeptical and she's afraid to bring it up to dustin because she doesn't want him to think she doesn't trust him. specifically in modern verse though with access to the internet and the news being way more accessible, she knows way more than she says for a long time until she just finally is like: Tell Me What Is Going On Right Now Dustin