I am finally getting around to updating this thread - sorry it has taken a while.
After my last post, Pepper actually had 2 really lovely days.
She was moving a bit more, still eating, and enjoying sitting in the sunshine with her brother.
I really thought we were getting on top of things.
But then overnight she went rapidly downhill.
She lost interest in food, was barley moving, and was constantly dribbling urine.
Metacam was not touching it, and we got an emergency appointment with the specialist.
He agreed it was probably EC, but as she had been so ill for so long he felt that there was little chance of a reasonable recovery.
We agreed to try and give her a bit more time for the Panacur to work, but that night she had her first seizure.
The following day we decided she had tried as hard as she could, but enough was enough.
We let her go - I held her the entire time, and it was very peaceful.
Thank you to everyone who took the time to post and offer support and advice.
Sleep well Pepper, and forgive me for not being able to do more.
I promise I will do everything possible to care for your much loved brother Chilli.