My wife becomes fixated on any one number of a subjects. Right now the target is the city and the way they are managing growth, last week it was my youngest daughter looking for a new job and bombarding her with job prospects until she messaged me to tell her to stop. this will take up all of her time. This type of stuff has happened with all of the kids. How do I manage this behavior?
Try not to allow wife to watch the news. It can become very disturbing. Keep conversations simple. Maybe don't tell Mom your looking for a job.
I recommend watching a whole lot of short videos by Teepa Snow. They will help you have some idea of how this mind is working, and how to work with it.
At some point the kids must learn to do a short: "Oh, oh, gotta go, Mom. Love you! Talk later" and click off the phone. The time she will be making calls is limited.
Fixated is a good word to describe this behaviour.
If your wife cannot self regulate these fixations, then she may need supervision & help to distract & move onto another task. I'm sure as the primary caregiver you have enough to do without adding to your workload :(
I wouldn't want to remove your wife's ability to communicate by text.. but then.. I guess you will have to work out if this is an area you want to 'police' or not?
A while back I was receiving daily calls from my parent asking exactly what I had for lunch. I did ask my other parent to stop these texts too but in the end I didn't want to add to their stress by having to 'police', so I just stopped replying.
I suggest you pick up a copy of Understanding the Dementia Experience by Jennifer Ghent-Fuller on Amazon so you can learn about dementia and how to deal with the whole situation. Lots of Do's and Don'ts are discussed in the book and tips for managing the various behaviors. Family therapy (without your wife) may be beneficial for your children as well.
Alz.org online is a great resource as well.
Wishing you the best of luck with a difficult situation.