How?
Her nudes are going to circulate the internet regardless of what she charges for them. She runs the risk of losing more fans by pricing herself out of the market. The whales are going to stick around no matter what. It's everyone else who may grow disinterested in her service that she has not taken into consideration because that is where the difference is made. They may feel disenchanted from her the longer this continues.
Her prices are so high, it'll cause buyers to turn to cheaper competitors or stop buying from her entirely. Her sales can drop and it'll repel potential new buyers (people who've never heard of her before, people who have yet to know she exists) from wanting to contribute and help her cause (meaning an aim people want to support). In other words, if nothing eles changes a year or two from now, she could wind up leaving tens of thousands of dollars on the table from all of the other folks she's not getting money from.
She should consider adopting the model that every video in her Onlyfans is a PPV. Using Rose Kelly as an example, she does this and her prices are not cheap. But considering Rose Kelly is fully nude in them, plays with herself, uses dildos to stick it in wherever there's a whole in her body, and considering those videos are ten- to fifteen minutes long each, charging $200 for each of those videos doesn't seem too unreasonable compared to what Madfry is charging for a video that doesn't reach a quarter of that length for a thousand dollars, basically.
The ironic part about pricing herself out of the market is that if she sets the prices too low, she won't make the kind of money she needs to sustain herself, and so she'll have to find a middle ground where both sides can be satisfied.
Doing what Rose Kelly does is not a bad idea. If Madfry puts out a video where no nudity is shown, where she's just twerking in a three- or four-minute video, she can charge, say, $50 for those. The prices don't have to be at the exact figures I presented, but you get the idea of where I'm coming from.