As they're finishing up their transaction, there's another wild scream from somewhere, and the camera is employed in such a way that it's kind of 3-D as far as why Aria would be freaked out right now. Say what you will about the stigma part, but actually being in a mental hospital is pretty much exactly as emotionally draining as you think.

Nurse Lisa: "Mona honey? You have a visitor, she says her name's Nelly Bly?"
Mona: "Ah. My anti-fashion nemesis, back again."
Nurse Lisa: "I'm just going to sit over here, not caring what you talk about. Sorry if that's inconvenient for a million reasons."

Mona, smiling meanly: "So. Would you like to play a game?"

She shuffles cards, and Aria looks like she's about to pass out, and it's so, so good.

HASTINGS/MARIN

Hanna: "So is your mom gonna save my ass or what."
Spencer: "She's working on blocking that court order, just chill out. You know how we Hastings Women have this unearned reputation for excellence? It'll be fine. Did Aria get into Radley?"
Hanna: "Haven't heard. Oh hey, is that Mr. DiLaurentis? When did he get back into town?"
Spence: "Today. Jason told me. Man, the face on that guy. He always looks like he just found his daughter in bed with a Democrat."
Hanna: "Don't talk to him. As will become clear later, there are reasons he's all on my jock this week."
Spencer: "Maybe you could talk to him, though. What if Wilden's just trying to scare you?"
Hanna: "He's not, I'm just paralyzed for reasons, again, that you don't know yet. I guess I can just chill and wait for your mom to save me -- or at the very least, hope Ashley goes on a bender and extends her weekend."

BREW

Emily: "There are things you need to know. About Jenna. Like she dated Garrett Reynolds."
Nate: "Whew! She could have been his next victim!"
Emily: "I mean to say, actually, the complete opposite of what you think I am saying."
Nate: "No, don't you worry about it. I won't tell her you told me about her dating a serial killer of women. We're friends!"