@LivyLoo11, update to what I said before:
I've checked with some other people who help here and one person suggested going into CAS and editing her tail from there, but it sound like you already tried that and it wouldn't let you do it. 🤔
Another person wondered if your original Sim had CC, and that maybe that interfered with the transformation process? Then they suggest using more mermadic kelp (either though another reward, or by finding it in the cave in Sulani, or through a cheat) to convert your Sim back into a regular Sim and then save that copy of that Sim to the Library as a default/backup. Try again to convert her.🙂
Finally, since you don't mind using Mods, maybe MCCC Mod might help?🤔 They think it has a command to fix or regenerate outfits, but they have never used it so they don't know what the exact command is.
I don't use Mods or CC myself (had too many problems with it in TS3 so I stopped using it and have never used it in TS4). But I am surprised that removing your Mods folder , deleting the localthumbcache.package file and repairing you game didn't do anything.🤨 It is difficult to determine what is going on in your game since we don't' know what Mod/CCC is the culprit. Usually doing the above will fix the problem and then you can go back and add your Mods and CC one by one, checking each time to see when the game starts acting up again, at which point it will be obvious which Mods or CC is causing the problem. Nobody else at this time seems to have any problems like this (whether they use Mods or not). 🤔 But if I hear of anything that might help I will tell you. Also, feel free to add any information and update us on if any of the above suggestions work for you! 😇
