Well, if one third of her followers buy one disc from Innova at $18 then that's nearly $350,000 in disc sales. If half of them buy just one of her tour series discs for $20 then that's over half a million dollars in disc sales.
Maybe a third or half of her followers buying discs might be a pipe dream but I have to think some percentage of them will buy a disc and some percentage of them might buy two or three discs so I'd almost be willing to bet that the total dollar amount of disc sales from having her on the team will likely well exceed what they are paying her.
About a year ago I heard from some social media person that a "good" amount of engagement (likes, comments, shares, etc.) is around 10%. It is a lot easier to get someone to hit a like button than it is to buy a disc, so the number of followers buying discs may be well below that.
Of course, those were general guidelines. Maybe followers in a niche such as disc golf are more likely to buy discs compared to how likely the general public engages with influencers they follow.