Just to reiterate what the others have already said, really. Chances are if this isn't the GS, then you might find you get some NFs creeping back in in the next couple of weeks (another BIG spurt around 4m/16w), but that's not a problem, just need to roll with it and feed.
If she seems happy in herself and is getting wet (even if not dirty) nappies regularly and gaining weight ok then she's most likely good.
As for the poos, I think my DS's record was in excess of 20 days, but, boy, did he need to go then!!!