You clearly love your Grey. I have to suggest stopping home treatments until a diagnosis is absolutely made. What you CAN do is prepare a 'brooder box' just in case she worsens before that vet visit.
To set this up, use a small box lined with soft clothes like tee shirts.
Use a thick, clean sock and fill it ¾ with plain, raw white rice. Knot the end and microwave it for about 1 ½ minutes. Shake it afterwards to distribute the heat and be sure it's not too hot. Tuck this in just under the cloths.
A heating pad under the box is also helpful, set on low. This is one of the few times I’d ever use both heat sources if necessary to maintain incubation temp (90-105 degrees).
If ever using an electric source for heating anything in anyway, please be vigilant and constantly double checking carefully.
Gently drape a light cover over this box to further help hold heat in and keep light low.
Again though, as long as she's perching ok and you're seeing relatively normal droppings this should be something ok until that vet visit.
If you notice droppings stopping or anything unusual at the vent (her bottom) such as protrusion, oozing, etc. - then it's escalated from 'ok to wait' to something you need to get her seen as soon as possible. And these symptoms would also indicate that the brooder box is absolutely necessary rather than just at the ready.
Does this make sense?