Mystified

Claire nursed for an hour at the breast this evening (with nipple shield and without the supplementer). While I am very happy about it, I am mystified as to how she could then take 3 oz (a full feed) by bottle immediately following. I know she was drawing milk because occasionally I would feel a trickle on my side. Why is she letting some milk escape? How much is she getting? Why is she not getting enough to satisfy her during an hour of sucking? Itseemed like she really was sucking most of the time and not resting or playing. I hope the opccupational therapist can shed some light on things.