I'm glad she's perked up a little!
Draining again may be beneficial, it's so hard to know. You can try to see if you can get more out, if nothing else, reducing the fluid may make her feel better for a time.
It really stinks that these hens have such problems. It's not just exclusive to Ex...
Cystic Oviduct, generally the fluid will usually be clear.
The exudes you withdrew remind me of EYP, perhaps material from Salpingitis or internal laying.
Sadly, it doesn't look very promising. If she's perked up with the draining, then that may make her more comfortable for a period of time...