I think it’s very natural for adult children to find their parents irritating, they’ve been hearing them say the same things all their lives. As the saying is, familiarity breeds contempt.
As parents we often don’t feel the same way, our child’s personality has changed so much since they were born, that their views haven’t had time to grate. Plus our love is more unconditional.
I think when younger, children have the same worldview as their parents, but part of growing up is deciding for themselves - and that can mean actively rejecting some of our views.
You don’t say what sort of things she is snapping at that you say. I remember once getting irrationally irritated by my mother fussing about me wearing a scarf because it was cold outside. I was married and got myself dressed everyday so it felt like I was still a child.
Its very easy to get into a negative spiral, and only you can change things by changing your behaviour, you can’t make her change hers.
She may be meeting lots of people with many different world views re politics, society etc. Just accept that this is just a part of her journey to adulthood, and as she gets older she will learn to deal with this sort of thing with more patience and kindness.
Sometimes adulthood is rejecting everything about our parents, before coming full circle and realising they’re not that bad after all.
It’s a normal phase they go through and it will pass.