Dear Daniel,

Very nice question.

Your premise may be correct, and it is in fact better to feed her the permissible food rather than a forbidden one. But the scenario very possibly could be that only the forbidden food is readily available, whereas the permissible is too inconvenient to access. But if you can satisfiy her crave with Heter rather than with Isur, do that. This is reflected in Gemara and Rambam [1].

Best wishes,

Yishai Rasowsky

Sources:

https://www.sefaria.org.il/Yoma.83a.15?lang=bi&with=Mishneh%20Torah,%20Forbidden%20Foods&lang2=en