Still not winning. I've taken the step of vomiting her today as she just wasn't emptying and the straw hasn't shifted. It's starting to come together again too. Two lots of paraffin haven't helped and she's not taken it in any grit either.
So, I've emptied her, and given her a little bowl of the mash (without probiotic, still with ACV, with a small pile of bread pieces, each one squished around a few pieces of oyster shell and grit which she's eaten with gusto! Hopefully that will start shredding the straw, helped by not having a big crop full of liquid to waft about in. She's still bright and happy in herself and hasn't lost too much weight, thankfully.