I had something similar and she ended up having Mareks, i will do more details below incase you’re curious.
She had a start of a lash egg and strange yellow lesions throughout the body, with ovarian cancer/ascites. She had enlarged heart and thickened stomach lining. She just began twisting her neck to the side, not eating, very strange (runny/undigested poop, or bright neon purple/blue, etc.) uncoordinated and began to be paralyzed for moments before getting up again. i just thought i would share. There are many other things this could be other then what was described above.