Some of the fussy ones get fussier with too many moving parts in their mouths. Try something like a Mullin mouth or unjointed low port.
Sometimes in our quest to get them in the softest bit, we forget joints can pinch and side pieces or rings bounce. Just keep trying stuff until you find what she likes to carry in her mouth. Doesn’t matter what you think it feels like, matters how she tells you it feels.
You got the correct width for her mouth? Too wide is going to wallow and get her fussing, too narrow pinches. Watch thickness of the mouthpiece too, narrower can be more comfy then fat.