OH, THANK GOODNESS!
Passing the egg on her own is MUCH better than the vet having to remove it.
Now, if you are feeding her gloop and raw produce (of, course, things like corn on the cob, squashes, pumpkins, potatoes, yams, etc. should be cooked) for breakfast and nuts for dinner, and keeping her at a solar schedule, I don't know what else you can do... I also don't know why she is so hormonal right now because that is what I do and it works for all my birds. Greys' breeding season is, more or less, from November to March. My Sophie, who has been with me for 16 years (she is now 23) follows the schedule perfectly. Dubis, the one that has been with me since last October and came in SUPER hormonal, is doing VERY well. It took her too long to abandon her second clutch and she still chews too much but when a bird has not been kept right for many years (she is going on 11, belonged to the same couple all her life and was kept at a human schedule and fed wrong -they sent the 'parrot' mix they used to feed her and which I promptly threw away), it takes a loooong time for their endocrine system to go back on track but she is doing GREAT! She came with plucked chest, belly, neck, back and top of wings and she has allowed her feathers to grow back - her chest and neck still look a bit uneven but it hasn't even been a whole year so I think her recovery has been remarkable.
I highly recommend you do a thorough re-evaluation of your husbandry and I'll tell you why.
I recently cared for a male grey that plucks and mutilates for about 4 weeks smack in the middle of the summer (June to July). The owner is a good friend of mine who has had a number of birds for many years (I've given her some), she is an elementary school teacher, has a master in Biology and volunteers every summer with conservation projects (she went to the Ecuadorian jungle this year) and she was worried he would mutilate and bleed to death in her absence so she asked me to watch him. I always thought she fed right and kept her birds at a solar schedule but she sent his treats and food and I then realized that she was making mistakes. His dinner food was a what is commercially called a very good quality parrot mix but it had sunflower seeds, peanuts and dried fruit treated with sulfites (I put the bin in the basement fridge and remained there untouched until I sent it back) and his treats were yogurt-covered almonds (gave him the sum total of two halves). His food had inferior quality and too much protein and the almonds had not only yogurt but also sugar and high fructose corn syrup). NO GOOD! He would sweetly ask for 'Yogurt?' but I discovered that a pistachio or a 1/4 walnut worked just as well.
I am SUPER strict with my birds light schedule and diet. I make absolutely NO exceptions. They get 2 hours of dawn and even more of dusk because I turn off their lights at 4:30 pm this time of the year (and there are no lights nearby because I live in a rural area, in a 6 acre property with the house 125 ft from the road so not even the lights from passing cars reach them. And they get no treats except for a little piece of a Graham cracker (organic, all natural and sweetened with honey) when I turn off the overhead lights in the afternoon -to give you an idea, Yogi Macaw gets 1/4 of a 'sheet', the greys, amazons, etc get 1/8 and the conures get 1/12. No animal protein ever, no sunflowers, no dried fruit, no salt, no sugar, no processed anything, nothing but gloop, raw produce and nuts (mostly walnuts but also pistachios, cashews and almonds.
So review everything you do and give her and see if you don't need to tweak something.