Nina is one of my fave pornstars of all time but I subbed to her shit about two years ago.... it was all screenshots from her Buddhabang and BangBros scenes and then some videos of her going to the supermarket and shit.
For the past year, she's marketed herself as "Houston's #1 FORMER Porn Star" and her shit was all sub-IG level. I notice she has taken the "former" off now, and the captions on her pics suggest it's explicit material. (So she probably needs cash) But I'm gonna bet that it's just more screencaps from her studio videos.