I hate the belt
But she also said she is 19, so not a minor. Dealing with a parent (or any heyholder) should not be about legal solutions to force the removal of the belt and more about a mutual understanding of why a belt is necessary and what the advantages are to wearing one.
Why are you wearing it? Just don't put it on after the next cleaning break.
Time for the bolt cutters.
Can't make you wear the belt if the belt is no longer wearable.
Helena Schedule a time to talk to your Mom so that both of you have a chance to cool down/your Mom doesn't feel trapped.
Make it fun, prepare tea and treats, do everything to show your Mom that you are an adult. When you are ready, clearly lay out the reasons you don't want to wear it and what it is preventing you from doing.
Ask her why she wants you to wear it, then talk about how you are ready to change, to become a better adult, and how by doing things X that meets the needs of your Mom, it obviates the need for wearing.
Obviously you haven't done anything wrong and you shouldn't need to do any of this, but, sometimes, as adults we make compromises to make other people happy.
They are your parents and it is probably worthwhile not to burn bridges as you may need them in the future.
You should also come up with a plan for what life would be like without your parents support, what you would need to get there, and how that might work out. It's something for you so that you don't get cowed by your parents into doing something you don't want.
may i ask to what extent you have given your consent to wear the belt? that is not clear to me from your previous posts. try to have a conversation with your mother by talking openly with her about your problems. a good key holder must always have the health (including mental health) of the wearer in mind first and foremost
Helena and she rejects it angrily
a good key holder should always conduct such conversations in a calm and level-headed manner
