I think all parties involved would have discussed the plan ahead of time . Leia showed from the beginning that she can handle herself and I think if Luke had expressed Jabba’s reputation and treatment of captive women , Leia would have told Luke that she is a grown woman and can handle herself . And where was it stated that Luke had sole input in devising the plan ? Perhaps Leia knew the risks and decided how to proceed in her part herself anyway . Still , the plan as shown in the movie was convoluted for sure .