Grulla to Grey help

[Avari0712]

Hi, I recently got a 6 yr old Grulla mare. I'm wondering if she will grey out or stay grulla.
Her dad never changed but her mom and grandma were born grulla but greyed out.
I attached pics of her and mom and dad.

 

[Folly's place]

Welcome!
"Grey' can occur in horses of any color, if one of the parents is grey. It is necessary for a grey horse to have at least one grey parent though. The color change can start very early (I saw a grey weanling once!) or a bit later, and every new coat will be a bit different, usually ending in white, or 'flea bitten' grey.
Grulla varies in tone with winter and summer coats sometimes looking a bit different, but that's not related to greying.
At age six, she's not going to turn grey, although some horses develop some 'ticking' or scattered white hairs in their coats.
Mary

 

[Bunnylady]

Grulla is the result of the Dun factor gene in a genetically black horse. Gray is the result of the graying gene in any color horse. Genetic gray horses are born intensely colored, then start showing more and more hairs that have no pigment at all.The white hairs typically show up around the eyes first, and by age six, would almost certainly have reached a stage often called "dappled gray."

If that first picture is your horse and she's six years old in that picture, I agree with @Folly's place , she isn't going to gray out.