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Compared to last season’s spiral of despair, Pretty Little Liars super sleuth Spencer Hastings (Troian Bellisario) has been back to her normal self in Season 4. But is that all about to change? Troian is tweeting about Spencer at “her worst,” and we are not looking forward to seeing Spencer cry again.

“I always think I look my best when Spencer looks her worst,” tweeted Troian from set yesterday, along with a selfie of herself looking a little bit worse for wear. The pic was snapped in the Hastings house, and Troian has big bags under her eyes à la Spencer, circa Season 3.

What could make Spener relapse into darkness? Could it have something to do with Toby? Things between the two have been tense since he asked Spencer to lie to her BFFs about his semi-alliance with “A” (and, even more so, since she told said BFFs). In the summer finale, Toby agreed to sever the lines of communication with “A,” effectively discontinuing his search for the truth about his mother, but did he really mean it? Could Spencer’s break down mean troubled times ahead for Spoby?

Whatever Spencer’s reasons for being at “her worst,” it looks like Veronica Hastings (Lesley Fera) will be there to pick up the pieces or, you know, criticize the pieces for not being as impressive as their big sister. Lesley sent her own tweet from the PLL set yesterday, confirming her appearance in the ep: “On set of #pll today...working on ep420!  Yay!” Huzzah! It’s been far too long since Mama Hastings has been in our lives.

Why do you think Spencer is breaking down? And what do you think Veronica will be up to in this ep? Share your theories in the comments below!

Catch the Pretty Little Liars Season 4 Halloween special on Tuesday, October 22, 2013 at 8 p.m. ET/PT on ABC Family.

Credit: Celebified Photo: Pretty Little Liars Season 4 Summer Finale Spoilers: Is Ali Alive? Will Spoby Ever Have a Date Night? — Exclusive