You might not want her to go broody this time of year, depending on your set up. If not, look into threads about breaking a broody hen.
If you do want her to go broody, go ahead and start collecting the eggs you want her to hatch, but don't leave them in the nest yet. Use those wooden eggs as bait. Once she's spent at least two nights in a row on the nest, then you can give her the eggs you want her to hatch. They don't have to be her eggs, she'll set on any eggs. Or, if you don't want to deal with cockerels, she'll happily set on those wooden eggs for about 3 weeks...that's when the feed stores here will start having chicks--not sure about your area. You could then buy sexed pullets and graft them to her and she'll raise them for you.