take no notice of the J'Arthurs above. Like most on here they are clueless about driving.
You do not have to stop, in fact stopping is very dangerous, what you have to do is merge, ie you have to fit into a gap between two cars that are already on the DC, usually they will cooperate as long as you are not being a plonker, essentially maintain your joining speed and "drift" into a space, try and avoid braking or accelerating. Your daughter should not be a distraction at all, you must concentrate on the road especially in a junction type situation.
Offer only your lack of experience and general contrition, you'll get a lenient sentance.