Warra,
Join the club. My 6 week old was like that, and she is only just settling donw. I would agree, use the motion thing, get her to sleep, even if it is in your arms, a sling, pushvhair or out in the car.
It is hard in the evenings when you are tired, hungry, and want a bit of a break - other than taking turns to eat, or grimacing while she cries if you put her down there is not much you can do.
I swear by routines (although 2 weeks is a little early) - but if you encourage her to sleep by walking, or driving, at least she won't be massively over tired in the evening.
If she doesn't settle, keep trying to offer food, and suddenly she may decided she's hungry, even after you've tried several times, and then she'll crash.
good luck, be brave, and remember, it really doesn't matter at 2 eeks if you do nothing but hold her, love her. To hell with the washing!!