Dealing with irrational fears - DD(6) terrified of the toilet

[Allfednonedead]

Any thoughts on how to deal with this one? My DD has suddenly developed a fear of the toilet - she made some association with fish and sharks, and can’t undo it.
We have looked at diagrams of plumbing, talked her through the life-cycle of fish, distracted her with YouTube, offered a potty or nappy, and told her she needs to face her fears. (Not all at once).
None of this has helped.
I am out of ideas.
Please help!

Sorry, more info - in extremes we have let her wee in the bathroom shower, but that’s obviously not a long term solution, and doesn’t deal with poos.
It’s only really a problem when she’s tired or stressed, but that seems to be most of the time atm.
She was diagnosed with ASD this week.

You've found a place she is comfortable weeing, which is good, as the first step there is done, you now need to get her sitting on a potty in the shower (Or a nappy), then you can move it out of the shower and further along the room each time until she's next to the toilet.
Very slowly do this over months.

You need to get her comfortable with pooing, will she put a swim nappy on in the shower or go in the potty there?
Then you move her slowly out of that safe space little by little.

We had this. We overcame it by decorating the down stairs toilet in all the things my son loved. At the time it was knights. We made it the most exciting room in the house. Put new knight toys in, bunting, books, stickers on the wall...I went in with him just to play for a few minutes at a time to stat with and within a few days it was sorted. Maybe worth a try?