My mom has Alzheimer's disease. She is confused and forgetful all the time. But I love her with all my heart and I will be with her for the rest of her life.
 confused forgetful mentally challenged mentally unstableconfused 是頭腦不清楚最貼切的字，forgetful 指健忘，mentally challenged 指弱智。
She is shy, but when there is a guest at home, she becomes exited and hyperactive and out of control.