The official reason is purely financial.
She says she was offered less money than she got for the previous film, Leonard Nimoy says her agent demanded 10 times more than she got for the previous film which would have been more than DeForest Kelley.
https://memory-alpha.fandom.com/wiki/Kirstie_Alley
Whichever is true it's a damn shame because she was MUCH better than Robin Curtis.
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Reply by sukhisoo
on July 5, 2021 at 7:24 AM
I agree. It seems they could have reached some sort of middle ground in negotiations. Oh well.
If Robin Curtis could have played a different Vulcan, it would have been a little more palatable.