If she was faithful, settled quickly, I only wait a couple of days watching if she is set like glue, then set eggs.
You get to where you can see the early "gathering" stage where they are on again, off again, but definitely getting ready to brood...then they set...stuck to the spot as if embedded in it...that only takes a day or two for me with an experienced broody to set eggs.
LofMc
Oh she's set (my 2nd timer), no doubt about that. I just have chicks hatching from my bators on Friday and Sunday and am thinking that is probably to soon. 3 of them are sitting on eggs at day 18, 12 and 4. My first timer will get homegrowns.