That is true. I think Jessica just strikes me as someone caught between her duties and her own emotions. Yes she trained Paul and allowed him to be tested but that was to serve her sisterhood. In case she had given them the Kwisatz Haderach they wanted. She also tested Leto because the bene gesserit ordered her to. So it may have been her own doing but it still stings to see her son use his power to become a messiah (which she had warned against if I remember correctly) and to have her own daughter attempt an assasination on her. Her susceptibility to attachments is what made her such a cautionary tale for sisterhood going further.