Imp,
yup, it's prob colic or gas. very common for young bbs. you hv to trial and error and see wat works for yr bb. carry, rock, pacifer, swing...
2 wks old bb are not able to recognise ppl yet. prob yr CL is calmer and more confident when carrying bb so bb calms down. bbs are very sensitive, they can sense when the person carrying them is stressed, anxious or frustrated and they in turn get stressed and become fussy. when the person carrying is calm, relaxed and confident, bb will be able to sense it too and relax too. just hv to practise more and learn wat bb likes.
try carrying her more when she's calm to gain confidence and let her get used to yr way of carrying.