I long lined her today [again in the single jointed full cheek, because that's what's on her bridle] and she started off confused as hell but once she figured it out she long lined like an old pro. She's giving to the bit easily and willingly both laterally and vertically, good halt, good reinback. I think she's pretty much mouthed now... very very clever horse this one and I've been idly working on it the whole time I've been working on bridling her. I have done it before and while I did it in fewer sessions with the previous horse, the previous horse was a lot quieter and didn't need quite as much of a baby steps approach.
The biggest challenge with mouthing Magic was that to begin with she would panic as soon as any pressure was put on the bit. It took her a while to figure out that it wasn't going to eat her.
The vet-dentist actually advised to leave her wolf teeth be unless I encounter an issue. They are quite small and while they are a little forward of her molars vet-dentist said they are high enough in her mouth that the bit should not go anywhere near them anyway. Next time I have her teeth done [she is due in 3 months] I will have the vet reassess.
Dulcify, what is wrong with a French link? She has a fairly low palate and I'm therefore not really a big fan of a single jointed snaffle on her [just using it because it's the only full cheek snaffle I have - though I don't think she needs the full cheeks again until I set to work backing her and even then only to remind her]... and as she is intended to be a dressage horse she NEEDS a bit with independent action on both sides, which a mullen mouth lacks. They are available easily enough with oval links for the horse that dislikes the flat link.