You could wait until day 20 and then give her back some or all of the eggs to hatch. However, if this is her first batch, make sure you check on the chicks after they hatch. I have had a broody or 2 that freaked out when the eggs hatched and she kept tossing the babies out from under her. A couple died before I found them (cold) others I brought in and warmed up until they were nice and fluffy. If my memory is correct, I believe 1 broody took to the fluffy chicks when they were returned to her (snuck them under her) and the other broody wanted nothing to do with chicks, she just wanted to sit on eggs.I'm totally seeing that already - even my 2 silkies were just so different. I just feel a bit sorry for her, she is so big adn I'm sure she didn't mean to - she is just young and inexperienced so I just want to help her so that she can be a good mama in the future (and hopefully for this hatch too) as she is a lovely gentle hen and I think she'll be a lovely mum.
What would you guys do? I'm thinking to give her some more plaster eggs and see how she goes then decide if I give her back some or all of the eggs with 'bator on standby!
Also, a bad Momma the first time isn't always a bad Momma the 2nd time, however, in my experience, if they are bad Mommas twice, they never get the hang of it. So I either get rid of them or they don't get to stay broody.