We need to realize that new laying birds will tend to lay soft shelled eggs in the first place, so that is nothing abnormal and doesn't necessarily mean she doesnt have enough calcium in her diet. Regardless, if she eats any of the calcium supplement, it should always be provided free-choice, in a separate dish so she can eat as needed in the case she does need some. It sounds to me like she is laying soft shells, and any little disturbance is causing them to split, which is nothing abnormal, but heavyweight breeds will also tend to crush their own eggs inadvertently since their so heavy.
If she continues laying softies, you may consider administering 23% calcium gluconate to her orally, at about 1ml a day.