Its hard to say what someone "really" is but Catholics have a pretty structured governing body that says these "XYZ are out platforms and even if you're not the most devoted person there's a bare minimum". They have guy who is like "yeah that's cool' or 'nah, we're not cool with that. It's easier to hit them with a litmus test that a Protestant.
I've been reading up on her and she seems like someone who might call herself a Catholic for clout, maybe because she was raised Catholic, but all over her platforms that stem from religious beliefs scream "Conservative Right-Wing Christian" which has basically become its own denomination...almost it's own religion.
She is truly religious. Not sold on the Catholic part except having a ton of kids.