It could be any number of issues affecting your girl. If it is a crop issue,you will know shortly if her crop does not empty. Definitely keep her warm,i use hot water bottles(i fill them with boiling water,this will last for couple of hours,then refill)if you are not comfortable with using boiling water,fill with very hot water,wrap in a pillowcase and place beside her,she will either lay beside or even sit on bottle,if warm she will move away from bottle.
I agree with Katy,dying process may be setting in,but i have also see the same symptoms on a bird with a head injury(concussion)no physical wounds showing,just the symptoms. I also agree no baths on a sick bird and i personally would never vomit a bird in critical condition. Often you will see birds shutting down trying to conserve what little energy they have left,this is why heat is so very important.
I agree with Katy,dying process may be setting in,but i have also see the same symptoms on a bird with a head injury(concussion)no physical wounds showing,just the symptoms. I also agree no baths on a sick bird and i personally would never vomit a bird in critical condition. Often you will see birds shutting down trying to conserve what little energy they have left,this is why heat is so very important.