Sour Crop

Hello, my first time posting!

I wondered if anyone has any advice, I have an ex batt with sour crop. Ive had her for two months now, she's never laid since I got her so Im presuming she's retired. 
On Sunday I noticed she wasnt eating, and on Monday felt her crop which felt almost gassy and squishy. She was also burping a lot which smelt and moving her neck about as if to try and clear something.

I googled it and realised it was sour crop so for the past day have been gently tipping her upside down and she's brought up a lot of foul smelling brown liquidy goo, presumably whats been stuck.  This morning her crop looks visibily smaller and feels dramatically smaller than the past couple of days which Im taking as a good sign.  The thing is though, she still wont eat. Ive offered her yoghurt, olive oil soaked bread, olive oil and this morning some cooked eat mixed with yoghurt but she wont even dip her beak in.  I cant say I blame her being off her food because being tipped til you vomit disgusting muck  must put you off your food but obviously she needs to eat.

Should I be syringe feeding her, or is it a case of when she feels up to it she will eat?

Does anyone know of anything else I could tempt her with?

Thank you

Hi Sarah and thank you 

Not long after I posted, she went down from the house into the run and started pecking about on the floor, which she's not done since Sunday so she's obviously feeling a bit happier.

I wondered about cat food because normally I have to shoo both this chicken (Cinnamon) and my other ex batt (Nutmeg) away from the cat bowls constantly. I didnt know if it was ok for them to eat or not but when they get the chance they love it.  I'll try that tonight when I get home.

Got home tonight and let them out of the run, she came running out of the house quite happily. She ate a bowl of salmon cat food and has been pecking around (and squaring up to the newbies through the side of the run!) and generally looks a lot like her old self. Hopefully we're through the worst and she'll just get better and better.

Her crop is almost back to normal, just a slight squidge at the bottom but she hasnt brought anything up today