Based on the scenario, Lanni seems to be low on the following traits:
Agreeableness: Lanni wants things done her way and dislikes it when others outperform her, which may indicate lower agreeableness. Agreeable individuals are generally more cooperative, supportive, and compassionate.
Conscientiousness: Lanni can be reckless, irresponsible, and sometimes cancels plans without communicating, suggesting that she may be low on conscientiousness. Conscientious individuals are typically responsible, organized, and reliable.