If you were on the main road and she came out from your left. and through a give way sign, she obviosly did not give way, so I would have thought she was in the wrong, as it was such a miserable night as you describe, I sugest she did not see you and pulled out, it does not matter what lane you were in she still pulled out in front of you, you don't say whether you hit the side or the back of her car, if you hit the back then her insurance co will fight you all the way, probably stating you were traveling to close, but if you hit her in the side, I don't see what they can say, it may be worth taking some photo's of the turning she came out of showing the give way sign, and the road you were on, for future reference