Mom's personality

In my nursing career we were taught that the subconscious attitude of an individual comes out when dementia hits. I have to say I am glad mom was always docile. She has her ups and downs but, I think that happens when she realizes that her memory is truly going and she has a very hard time doing the simple things. Such as toileting, setting the table, putting away her own clothes. But, she gets angry at herself not at anyone else. She tries so hard then gets upset when she can not succeed. I wish I could find things that she could accomplish.