Scouted by an ageny, how to convince parents to let me model?

[highface694]

I got scouted by a modelling agency via instagram a month ago (they are reputable and I know 2 people who model for them who go to my school) when I asked my mum if I could model for them it was a straight up no, she didnt even consider it. I met the scout in real like 3 weeks ago at the shops and she gave me a card telling me to keep in touch. Recently she got bacl in touch with me. I am only
14 but the scout explained I would only be in
development. I am a straight A student and I doubt I will ever make this a career but this is something I would really like to try. I am scared to ask my mum again as she doesn't listen to my prespective and last time we had a big fight about it. What should I do?