Sorry Meredith (Amanda Schull), but we just don't trust you.

Although Byron's (Chad Lowe) girlfriend got all buddy-buddy with Aria (Lucy Hale) on Pretty Little Liars Season 3, Episode 15: "Mona-Mania!," we're far from convinced she's as innocent as she seems. In fact, at this point we're starting to think she might have more to do with the central mystery of the show than we ever expected.

That's right: We think Meredith might have had a hand in Alison's (Sasha Pieterse) untimely demise — or, at the very least, might know something about it. Here's why.

1. Her story about Byron is a bit too convenient. Meredith went from cold and distant to confessing everything to Aria over the course of one episode, which sets off alarm bells. Her story seems to tie in perfectly with all of the doubts Aria is having about her dad, which immediately made us question it. On PLL, things are rarely as simple as they seem. Our guess is that Meredith's version of what went down both in the past and present isn't entirely accurate.

2. She has motivation. Alison was using Meredith's affair with Byron to blackmail him. On top of that, we know Ali once tried to trash Byron's office, and made it look like it was Meredith. And we wouldn't be shocked to learn that Ali went after Meredith more directly. Meredith had motivation to hurt Ali — or to seek her out on the night she died, which could have led to Meredith seeing something she shouldn't have.

3. The fire. Yes, Lucas (Brendan Robinson) claimed that he started the fire in Season 3, Episode 14: “She’s Better Now” to hurt Monal (Janel Parrish), but we're not convinced that was the whole truth. Is it possible the "A" team was targeting Meredith because she knew something about what happened to Ali?

4. Why is she back in Rosewood. Alternatively, could she be involved with the "A" team, perhaps because of something that happened with Ali? Her sudden appearance at Rosewood High is still might suspicious.

Of course we could totally off base. Share your thoughts in the comments below!

Catch the next episode of Pretty Little Liars on Tuesday, January 22, 2013 at 8 p.m. ET/PT on ABC Family.