- As far as other interactions in week 1, I think that Steve would guess that based on the fact that she's speaking so passively that she might have been captured the same as them, but she's been there longer or has some sort of magical ability to allows her to be treated differently than the rest of them (since her face has changed). If he was ever able to catch her alone pre-ascension, he would try to reach out to her and let her know that if she was here against her will, they could try to help her. He wouldn't outright say they were planning escape, wanting to see how she reacted to the more vague offer.

- In week 2, after the ritual, Shepard will be assuming that they aren't going to get out of this situation alive unless they take drastic measures. The side effects of the ritual would also make her more paranoid so that she potentially sees the acolyte as the enemy (even more so that before). She would try to approach her by at first coming across as rather quiet/pathetic as she struggles with the ritual's effects to get close, and then would jump her to try and take her hostage/demand answers. If this isn't possible, she would be open to trying it on one of the other acolytes instead. Whether or not Steve is involved in this part of the investigation probably depends on how things would have played out in the week one stuff above.