I haven't read the whole thread, so pardon me if I backtrack or repeat a previous point, or am generally unhelpful...
Seize a moment in there and take control back - for example, there's a moment where you say "Jane, you must feel overwhelmed, but it seems like you are handling everything so well.
Let's take a tea break." Or, "
Walk me to the elevator so I can deliver this to Jim."

(Insert real smiley in convo LOL!) This helps maintain control. You can give her everything she needs, but you can end this convo when it is right for you too, without any sense of cutting her off, and without you draining your battery. Watch ENFJ's - they do this brilliantly.
See, I'm usually not wary of Fe, because, since I rarely lie, I tend to (irrationally) assume that other people are generally truthful, so when I see things like this, it gives me cause to doubt. I quoted this example, because my best friend is an ENFJ who has done this exact thing to me on numerous occasions. And it makes me sad to think that there's been a motive this whole time. I hate being the stupid one - the one being used and controlled without my knowledge because I'm too ignorant to know the difference. And yet, that seems to be how it is with him, and maybe with others. Who knows?
But anyways, here's an example of a time when I HAVE been wary of Fe (even though I'm usually not):
At least 2/3 of my dorm-mates this year have been xSFJ. When I walk down the hall, they're always cheery and smiling at me like I'm their bestest buddy, and when that happens, I can't help but think "They can't love EVERYBODY, and yet they act like they do. So how am I supposed to know where I stand with them? I can't read their secret Fe code!!

"
And when I used to ask questions like that to my aforementioned ENFJ BFF, I'd get answers like "I dunno. I don't rank my friends." Which makes sense technically, but it's more proof of how differently we think, because at the time my internal response was "That's helpful. Thank you.

"
But to answer the question in the OP: I'm wary of a certain type of Fe (i.e. nice/cheery/undiscriminating with everyone), but I'm usually not in the loop enough to be wary of anything
