You're in the same boat as me.....
We have no cockerel. A cockerel is not required for a hen to go broody. Some breeds get broody more than others (Silkies are famously broody, Rhode Island Reds not so).
If you want chicks then you could purchase fertilised eggs online or from someone nearby and put them under her which is what I am planning to do this time.
Last time this hen (I suspect it's the same one) went broody we got some fertilised eggs for her to sit on but I think it was too late in the year (November), we were pretty clueless - and nothing came of them. She sat and sat and eventually got bored and was delighted to be let out of the broody coop....... Now - we can't get her to settle back in there again :-( and she's sitting tight in one of the main coop nesting boxes which is about 18 inches from the floor....... not a good height for a chick I suspect!...... but our one attempt to move her to the broody coop (a large rabbit hutch) didn't go down well (bad memories from last time???) and so I'm waiting until perhaps she's a bit more "set" before trying again........
If you don't want chicks then there are various suggestions on the forum from time, nature, dipping bottom in cold water etc etc.......