Answer – You haven’t given me very much to go on here. I am presuming your mother practises witchcraft from the fact she has chosen to use a working against you. I’m also presuming she is pretty good at it as in general it is difficult for one witch to fully bind another. I’m interested as to why she has bound your powers… Have you been using them in a way she dislikes? Does she believe you are too young to practise witchcraft?
It’s a tricky one… morally I am reluctant to offer any advice that goes against a decision a parent has made for their child. That is not to say parents are always correct but it is perhaps not my right as a stranger to your family to make a judgement on that either way. My thoughts here are that communication rather than spellwork will be your best chance of getting back your powers.
(A note on “powers” – witchcraft is not fundamentally about having specific powers, it is about understanding how to channel energy and intent. What I suspect your mother has done here is bind your ability to produce results from your efforts at magical work. If she’s managed this then kudos to her, she’s good at what she does. It is important however to understand the distinction between having power (television witchcraft) and using power (witchcraft).
With regard to better communication I suggest you ask your mother why she has chosen to bind you. Can the two of your reach a compromise? While you are a minor and living under her roof she does have a right to have an input into your behaviour. Can you agree to forego certain types of spell work for the right to be able to do workings in other areas? I think this is your best bet, if she has bound you so successfully then I doubt anything you can throw at her will negate the effects of her binding. Being reasonable and honest and going into a discussion prepared to listen and compromise would seem the rational way forward.
I probably should leave it there, lol… But if you really are determined to take action on this – has she left any evidence of the spellwork lying around? Easy enough to dismantle a binding if it has been based on a physical representation - which my binding spells always are...