I had a resection done due to twisted colon. Though I have Crohn's, the twist was unrelated. After about
2 months (probably once insides were healed). I had my first what is considered "normal BM". It had been so long since I had, that it actually freaked me out. So in answer to your question "yes", if the Dr. say a normal BM will happen, I believe that it will. Hope this helps.
PS Tell your cousin not to get too discouraged at first. It really takes about 6 - 8 weeks for the insides to heal.