She was uncertain if they all fully believed her words about what happened, but she had still managed to convince them enough to go along with that approach.
Even Cedric had agreed that such an approach was the only one that could be used when they had no proof and could not act against Silas or his group.
The intention behind her plan was to expose him for what he had been doing by making him act again if he was granted another opportunity.
If another coincidental accident happened again, then it would only help to confirm his intent behind the things he had been doing so far.
They may not have been able to watch over Ash the whole time since they were navigating the surrounding area and looking out for their own safety at that time, but they were still able to keep tabs on her.
The moment that something did happen, Cedric was the first to turn around and move toward her to make sure that she was safe.
