I had a discussion with a JW friend a couple of years ago at a transitional point when I was starting to wake up - we were having lunch and she proudly talked about her 11 year old daughter, the good girl she was becoming etc - sadly she was being badly ignored by the other youngsters within the congregation, who come from big influential families in the organisation. My friend said that her daughter was really keen to get baptised.
A friend who was with us that day and in 'excellent standing' said its better to wait until she's older.
And I said something like ' it IS better she waits until old enough to understand what baptism as a JW really means, it's not just a personal dedication to God which begins a life journey - but a vow to obey the organisation.....and for that reason alone, she must be old enough to make that vow whilst understanding everything it means'
Perhaps you could say to your mother that you consider a vow to the organisation to be a very serious situation - many non witnesses get baptised into a relationship to God and call themselves Christians , but JWs are different - we vow to obey men as an extra to the scriptural baptism.
That's serious in a mighty different way.