Dementia is a tricky disease. There are some common signs/symptoms that most people will experience however, not every person will behave in the same manner; therefore, making it difficult to determine future behavior.
The way to get the answer you seek is to go to Alz.org where you can find a list of different stages. This should give you an idea of what to expect and what stage your mom is at.
To answer your question "yes" it will change her disposition. Sorry:(
Too many variables. What type of dementia does she have?
My stepdad was diagnosed with dementia, but died of cancer before the dementia became too debilitating. He was quite childlike, but would say inappropriate things at times.
https://www.agingcare.com/topics/8/dementia-behaviors
The way to get the answer you seek is to go to Alz.org where you can find a list of different stages. This should give you an idea of what to expect and what stage your mom is at.
To answer your question "yes" it will change her disposition. Sorry:(
What's to come depends on all sorts of things, not least the type of dementia and your mother's underlying, lifelong personality.
Teepa Snow's seminars (Google her) are extremely helpful in explaining some of the common problems and suggesting strategies to cope with them.
May your mother never develop some of the more "interesting" aspects - fingers crossed for you!
My stepdad was diagnosed with dementia, but died of cancer before the dementia became too debilitating. He was quite childlike, but would say inappropriate things at times.