Well, since we are all making "educated" guesses, I would go with a hereford, angus, shorthorn cross also . Legs look a little short so that probably rules out any exotic crosses like limi or tarentaise, could have a little bit of simental but can't see her rump. Darker nose means some angus in here somewhere, rather than real pink and she doesn't have the build so probably doesn't have charolais in her. Doesn't matter if she milks good and raises a nice calf.
It's hard to tell from the angle of the picture. I can't see her rear, her neck and head or how big she actually is to get a sense of breeding. Can't even see her leg to torso ratio properly to tell if she even has some continental breeding in her.
But that lightness around the eyes tells me that she may have some continental breeding in her, and it shows up in the calf too. Shorthorn, Hereford and Angus don't have those light points around the eyes like gelbvieh (or limousin, charolais or even some simmental) do, and her head actually looks quite gelbvieh-ish. I'd know limousin if her lip was not curved at the sides, and it looks like it's curved like in any other breeds; it's not showing up in the calf either. But a different picture from the side will verify that. Gelbvieh does have dilution genes that can cause offspring to come out grey like that.
She might have some simmental too. But one thing is for sure, she's a real mutt of a cow! (And I mean that in a good way!)
Momma looks Angus Sim X. BUT, the first thing that popped into my mind is a red baldy.
The light eye pigmentation I've seen show up in composite breeds, even in Beefmaster.
Not a great picture to illustrate it, (not mine) but you can see the light eye pigmentation in this Beefmaster calf.
Older Beefmaster bull with same pigmentation:
If calf's sire had been Char or Sim or even Sim/Char X you'd know it--it will lighten up considerably as it gets a few months older.
Entirely possible as well, that the momma is Beefmaster. They don't all nowadays have the heavy Bos Indus influence they once did.
But yep, lots of "diversity" in that momma.
If you are in the southern or southwestern US, the light color around the eyes would be considered a somewhat minor undesirable trait.