Worth candling after a week next time - then you can move her on to fertile eggs more quickly if necessary. I've just posted on another thread because I had a broody who hatched chicks two weeks ago after sitting for about 50 days. She had fertile duck eggs under her that were fine up until hatch day and then died before pipping. She hadn't lost that much condition or weight so I got some chicken hatching eggs in for her instead. According to the vet, even if they're broody, they may not lose that much weight because laying normally takes so much out of them that it's actually easier just sitting there all day, not burning off that much energy or laying.
I just feed them lots of goodies, make sure they're wormed and although they lose some weight, it's nothing dramatic. Personally if she's still broody tomorrow, I'd give her a go with some Legbars.
H