Possible ascites

[Chickenkeeper23]

I have a 5ish year old easter egger. I’m thinking she has ascites. Its progressed pretty slow but shes starting to walk more upright sometimes or drop her tail. I’ve felt it but it doesn’t like just fluid. It kind of feels like a hacky sac and gritty. Maybe tumors :’( wanted a second opinion before I possibly attempt draining.

If draining what size needle and where to insert?