Quite the opposite - she'll get a bunch more allies.
Yes. A bunch of allies whose support would be purely conditional. If she centred transmen once, would she be permitted to go back to her previous way of speaking and writing? Would they say, "hey, Hibo isn't transphobic, look at this screencap?"
No. Few can ever place themselves truly beyond criticism. Katy Montgomerie, a young British transwoman and trans activist who is very active on twitter, got denounced as a terf the time she said people couldn't change their genital preference. She felt forced to apologise. Katy is actually definitely trans.
In order to keep the new allies, she would have to phrase each and every tweet and tiktok video thereafter with them in mind. Otherwise, pileons, or they would threaten to withhold the donations. Which would be dreadful if this happened at a time when she'd come to rely on them.
So gradually, Hibo would feel pressured to centre her Western donors in her tweets and talks, rather than the people performing FGM and the women and girls who are subjected to it, regardless of their gender identity.
Inevitably, her tweets would lose their force and power as she got tangled up in making disclaimers. Hence they'd become inaccessible to the target group, who speak English as an additional language.