Honestly, I was impressed that she played Coulson well enough to get him into the brain reading machine dealie.
It didn't even really seem that hard, though. It mainly consisted of her killing the dude who had been trying to torture Coulson into using the machine and then saying, "You don't know what happened to you, really, but you want to know. Don't you? Well, don't you? You know you do...go on, get in the machine. It won't bite. It's just like riding a surfboard." And then, bam. He was ready to get in the machine with very minimal fuss. Eh, maybe that flowered dress is doing more than I thought it was.
I just don't like her. But then, I haven't liked her since she ramped up her presence on the show in earnest with fire hands dude. I feel like we are just supposed to accept that she is super competent and devious plus mysterious and sexy/dangerous just because they say she is and people keep doing what she says. Now even the Clairvoyant wants to be down with her even though a few episodes ago dead minion claimed that the Clairvoyant didn't talk to anyone but him. Maybe this girl got a secret makeover from Freddie Prinze, Jr. like that girl in She's All That and now she's irresistible and also does spoken word performance art in her undies. She persuaded Coulson by subliminally telling him to be silent, be still. Makes as much sense as anything else.