Just look at the way she acts: plenty of Fe, always expressing herself. I would argue for I on the grounds that what she says comes off as somewhat restrained or filtered, as thought it's been thought through first.
Si as a dominant function: VERY conflict avoidant, or so it seems to me. Good aesthetic taste (supposedly), and the kind of generally sanguine attitude that goes with this type: this is a bit hard to articulate, but I think anyone who's talked to her for more than 5 minutes knows what I'm talking about. She doesn't like to be the center of attention in chat: she always seems as though she "tones down" whenever people start to focus on her. She's also definitely gossipy: I think more than a few of us can testify to that :wink:
Ti hidden agenda: She seems to love it when someone is willing to be patient with her and explain something out step-by-step, as I've learned in my brief interactions with her.