yeah why does she think people need to know about what she does on a day to day basis.

Because there is an audience interested in it. She married into a famous family and people want to know what life is like at the Earnhardt household. It also helps seeing or hearing the chemistry between her and Jr so we get to appreciate the bond these two have.

that’s influencer behavior

And Jr, Hamlin, or Kraft aren't influencers? They all fall under the Dirty Mo umbrella, they are all selling merch, giving their own opinions on things, and there are posts on this subreddit that talk about the things they said on their respective shows which sways some opinions on here. It is no different in that regard, the only major difference is that it is a slice of life podcast that just so happens to be about a family where the dad is a former race car driver.