Why does my dog eat grass every single morning?

So I have been observing this with Greta lately, she goes out first thing and immediately starts grazing like a small cow. Every morning, very deliberate, not frantic. She is not vomiting afterwards, seems perfectly normal otherwise.

I know the usual thing people say is 'dogs eat grass when their stomach is upset' but in my experience with the breed, Schnauzers can be quite routine-oriented and also quite... opinionated about what they want to do. So I genuinely cannot tell if this is a digestive thing or just a habit she has decided to have.

I did some searching and got the usual mix of 'totally fine' and 'could be a sign of something.' Not very helpful.

Has anyone here seen consistent morning grass eating in their dog, and did you ever find a clear reason for it? Did you change anything, diet or routine, and did it stop? Curious whether this is worth a vet conversation or if I am overthinking it.