Mom has exhibited typical BPD/narcissicistic/ocd behaviors my entire life, with some psychotic outbursts. Now she is old and also showing dementia like behaviors. But she's also been a very clever actor, turning the crazy off & on at will my whole life. How is anyone to tell what behaviors are what and how to respond? E.g., long hysterical crying jags when she doesn't get her way, pretending she can't talk, or walk. And then being just fine moments later.