There are occasions when she does get angry. In The Enchanted Parade, her patience in aiding Akko was eventually tested when the latter accidentally rips up the sheet music to Lotte's ancestral song. Lotte became upset to the point of becoming sullen and even colder than she normally was, as Sucy pointed out. She stops talking with Akko for some time because of how she is upset at her. Nevertheless, she still considered Akko as her friend and supported her determination to become a witch