Browncoat, I don't know much about your connection with this girl. But if that's real love, then what is there stop you.
If there is love, there is a way. Love can take all these seemingly huge obstacles and turn them into formalities.
People that have never experienced real love, will not understand this, so don't try to explain to them. It can work out, all you two need is lots of love - the rest will fall into place.
It might seem she is young and the "the world is at feet" but that's an illusion that lasts for an instant. In no time she'll be your age.
Nothing she can accomplish would be greater than finding true love.
Her mom talking to her can definitely confuse her. Most mothers would be against it, and for a good reason, but if there is real love involved, then her mom is wrong to try to stop it. Look around you, how many people do you see who are crazy about each other 20, 30 years after being together. It's very rare, and if you have it, you have found the only thing that's real in this life.
Be patient with her. If you love her, don't disappear from her life. Tell her you will be her friend if that's what she wants. If your feelings are genuine and hers are too, she will respond.