Well, if she took the advise of her family not to listen... then it's more probable that she "heard" theories from people she's discussing it with (as you were thinking). Family, friends, ex-roommates.
I think if I was in her shoes I might be curious, but my curiosity would quickly be over once I read what some of the internet trolls were saying cuz they can be QUITE mean. And... everyone is out for blood when it comes to JS, so... I'd think that even if she took a quick peek, that would be more than enough and she'd never do that again. It's too disgusting, things are too fresh for her, and let's say she had no inkling what was going on... she now knows the ugly truth... and under her own roof and under her watch. There's got to be a lot of self-hatred going on. I can only imagine that everything would remind her of Maddie.
Plus, her life is pretty much over as she knew it. She's too recognizable, she's even talked about that in one of the recent videos. People coming up to her when she's at the grocery store, etc. She will never have a normal life again.