Yes I can understand that keeping quiet. It does seem trivial to some in the scheme of things. However, sometimes it can be a smaller thing that tips the scales.
As previously mentioned, I had all my teeth taken out aged 11, lived in a violent, abusive, neglectful household as a child. Was badly beaten by my father as were my mother and sister. My young brother took his own life. I was visiting my 16 year old nephew as he died of cancer. His mother collapsed in the hospital ward. My husband has cancer. Self pity? Well maybe. Or mental overload.
I'm glad you and your daughter have coped so well.