On that note she's only valuable when she keeps that knowledge to herself. It's the kind of world-shattering, paradigm-changing knowledge that gets people killed. I'm happy she only chose to reveal one formula and it looks like the schemers in this arc will get some kind of punishment, to deter other bullies from targeting her. But I don't think the national-level powers will be deterred from using violence to claim her knowledge.
Here's hoping for royal bodyguards, maybe she gets hired by the royalty to teach formulas to a select few within the royalty only. I think teaching it to the four powerful houses will only cause internal strife.
She's still a child of one of the ducal houses, even if her reputation is (or was) poor, so it's not like just anyone would dare to approach her with ill intentions. In fact, within her own family, this should turn her from a problem child into a valuable child. Fortunately she has been getting along better with her dad, the duke, of late. I have no doubt her brother will still keep hating her, though, maybe even more than before. If you have looked down on someone for years, it can be kind of annoying if that someone suddenly becomes famous due to their great contribution to the whole nation.
But yeah, she absolutely needs to keep her secrets for as long as possible. However, this one time was important because it made her important, and she can benefit from that. It's not like she would strive to live a quiet life out of sight anyway, haha.