Hi Suzie, I agree with Mel
though I would give her a day or so, just to see if she is definitely serious, mark the eggs she's on now, so you can take away any freshly added.
Then if she is still sitting tightly after a couple of days, move her, and the eggs she is on now, at night in the dark, to the new place.
Then keep her locked in for most of the next day (no peeping
)
If she is still sitting tight 24 hours later, then get the hatching eggs under her (again at night) and you will have the best chance!