little lady sounds like you have a mass in there but its caused a fungal infection by allowing food to sit too long. when she vomits does it smell sour? if yes that sounds like sour crop if thats the case id suggest an anti fungal,cant see where you are if usa then monistat if uk then canesten both from chemist and people meds. get 3 tablets cut each into 3 pieces and give 1 piece morning and 1 piece evening. til all gone or you can get to vet mon. you can try vomiting her before meds if your comfortable with doing that. it can be risky. but only before meds not after. then when you get a liquid free crop if theres a mass you could try veg oil and massage to break up that mass. id suggest mashing food to get some nutrition passed that mass. cover pellets with boiling water to mash easier then top up with cold water until runny mash. make sure its not too hot you dont want a burnt crop. massage a couple times throuhh day to work food down and keep her strength up. these cases tend to take a while to correct so best to try and keep her strong. good luck xx it always happens on a weekend!