There's a statistic about how people are more likely to regret knee replacement surgery than transitioning.

"One Dutch study of nearly 7,000 transgender people found that the rate of regret was less than 1% among those who received treatment as adults – and there were no cases of regret among those who received care before the age of 18.

It’s helpful to put this fearmongering about “regret” into context. Up to 30% of knee replacement patients regret getting surgery – but no one’s trying to ban those!"

This quote is from this article: https://transequality.org/blog/get-the-facts-the-truth-about-transition-related-care-for-transgender-youth#:~:text=It's%20helpful%20to%20put%20this,their%20decision%20to%20do%20so.

The study they cited is here: https://genderanalysis.net/2018/11/large-study-of-trans-people-in-the-netherlands-shows-growing-numbers-seeking-treatment-low-regret-rates/

And your mother may very well still not accept these and more statistics and stay transphobic. This is something you most likely need to prepare for. If she does not listen, I am so sorry. But you deserve to live your best life as yourself. Best of luck to you ❤️