Unfortunately, there are few female athletes in any sport at any level getting advertising deals. The college level players are competing with pro athletes, most of whom have greater name recognition. Paige has a significant number of followers but outside of the relatively small women's basketball community, she is an unknown. Predict that comparatively she will do well, but the windfall some are predicting may take time to develop.
I guess we'll see how it all plays out.
According to The Wall Street Journal, a law firm hired by the NCAA noted in a report that Bueckers has 900K (actually 910K) followers on Instagram, which is "more than the twenty 2021 Men's Final Four starters combined." They also determined that she "will likely be the nation's best-known college basketball player (male or female)" during her second season. Apparently, 21% of all Americans are 'very interested' in college basketball.
Not sure how "relatively small" the women's basketball community is, but it seems likely that her fan base, and people who know who she is could be larger than you think. As far as windfall predictions, her agent Lindsay Kagawa Colas of Wasserman evidently "didn't blink at the $1 million estimate".
Is she going to compete with LeBron? Of course not, but she's going to do pretty good, and as I believe Geno said, it won't just be free donuts for life.