I am not sure I would have been able to do what you did; I am too selfish and wait all year or two to be on Camino.
Tough love would tell me that instead of supporting such a terrible decision of another pilgrim that obviously did not read a single reference about how to walk the Camino, I would have taken her aside and calmly explained that if she would look around she would see not another single pilgrim that is carrying anything similar to the weight that had overwhelmed her. Extend an invitation to go through her pack to assist iidentifyingng everything that is unnecessary, allow her to choose what will be given away, and then assisting her in repacking the balance. If it is still too heavy, repeat the exercise until such time as she is comfortable carrying her own pack. She has more to learn from this Camino than abusing the Camino of many others.
I admit that I am crabby today and I am not going to be patient with too much stupidity. Work is very stressful at present. Having someone ruin another's Camino simply because they chose to be unprepared is too much. She either carries her pack and take a bus, a taxi, a train, a bus, a horse, a wagon, anything she wants except the back of a prepared pilgrim.