Inalu is not a nanny, but she is asked to take care of the next heir to the Continent of Sismoa - Addy Les
No, she is not here to be a nanny, she is the one who has accepted the mission to kill that proud young master.
But why did she, who had always been so cold, feel vaguely intolerant when she started to attack?
Why? Why was he misunderstood despite not killing him?
There is no reason, because if you missed it at the beginning, you just missed it.