Spuzz
Brooke seems fine but for with the putter , pretty sure they said already 5 changes this year. To me there is a mechanics issue and like back nine yesterday a confidence issue.
Shes a feel player which is fine but her fundamentals in putting could be better IMO. Im sure there is a benefit to having her big sister on the bag but like you wonder if she might be better served by a long time pro caddy in some aspects.
Brooke has been successful at a young age, perhaps they are thinking why change a good thing. Plus, shes doing well off the course woth endorsements.
Dont know the answer , just know she needed help on the back nine yesterday and didnt get it, also got a bad read on a shortish birdie putt.