Being paid "out of" and "based on" the principal are two different things. You were suggesting that her compensation was "based on" the value of the trust (ie, 2% of the trust value). That wouldn't change after the sale. That line about not being paid "out of" principal was interesting to me, which made me wonder (as you did) from what source her compensation comes.
If she is, in fact, being paid with profits from the trust's business operations, that wouldn't necessarily cease upon sale of the team. For instance, the trust still owns the Seahawks as well; those profits would still exist to generate a source of income to the trustee. I'm sure the trust still owns other businesses as well. The sale funds could also be invested and she could be compensated from the rate of return on said investment. There are many possibilities.
Again, all I'm saying is that the claim that she benefits financially by not selling the team is all speculation, and I thinks it's irresponsible to state it as fact.