Well, just because they run into some people that Ameena doesn't know doesn't mean that something weird has necessarily happened - she doesn't know what's happened. Her theory right now is that the four of them have been flung to different places - she presumes they are all
probably each in a separate location, based on the fact that she herself is clearly alone right now with no sign of the others nearby. If they take a while to meet up, it won't be completely unreasonable that other members of the group may run into, and join up with, other people while they're wherever they are. If everyone's all still together when Ameena finds them, she'll probably just assume that they all happen to have found each other first (ie, she's the last one to rejoin them).
Regarding Farel, you might want to remind me of those points about him when they meet up. And also stuff like was he looking for his squire back then too, and if not, what was he doing in the dungeon? Since I gather he wasn't with the group when they got thrown back (and therefore didn't wake up with them in the "starting" room), that implies he was in the dungeon two weeks ago and remained there for the duration of that time in order for the group to meet up with him two weeks later when they made their original foray into the dungeon. Rather, he's in the dungeon
now, since "now"
is two weeks ago, and stayed there for the whole time, presumably looking for his squire or maybe was a prisoner or something, before the group encountered him on their first run-through of the dungeon. How they met him and how they parted company are things I suppose Ameena would remember, as well as whether his appearance looks different (fine if, as with the others, she can't remember exactly what he was carrying).
Regarding the nasty little magic gnome fellow, if the group haven't got round to getting blown up by him yet(

) when Ameena reunites with them, I'll be wanting to know stuff like roughly what happened when they met him before, because I imagine Ameena will remember if he was killed or whatever, and what kind of stuff he did like whether he tried to trick members of the group, or blow them up, trap or torture them, just send in his grak-grak thingys, whatever

.
But anyway, this is all for whenever they do actually reunite - it's not really relevant now

. I was just mentioning it as something I'll be wanting to know whenever the time comes

.