My answer however i need help with it as you can see i haven't answered the question fully-her attitude was always positive but can be undone quickly by her disturbing thoughts-

The question says Explain, using your own words, what Christopher tells you about his mother’s character
in lines 22–26
and here's the lines of 22-26
I began to remember one
occasion when my mother and I had indeed been standing together up on that
attic floor, for all I know playing this game of ours, when she suddenly stopped and
became very still.
My first thought was that I was about to be scolded, perhaps for something I had just
said which had displeased her. It was not even unheard of for my mother to switch
moods abruptly in the midst of a good-natured exchange and scold me for some
suddenly remembered misdemeanour committed earlier in the day

1 answer

This is your answer.

"her attitude was always positive but can be undone quickly by her disturbing thoughts- "

If you added appropriate capitalization and punctuation, your answer would be good.