You can pile up some eggs, fakes are best, in a nest and she might sit on it....but probably only if she's already broody....more coincidence than cause and affect.
Some breeds seem to be more prone to brooding than others, but it's no guarantee.
Ditto Dat^^^
Many incubators are not accurate for temp, you need to test/calibrate those thermometers.
Here's some info on testing therms and hygros:
https://www.backyardchickens.com/articles/testing-calibrating-incubator-thermometers-and-hygrometers.73634/
Almost impossible to do.
A bird is...