I just wanted to say that your trip sounds amazing! If you want any advice on places in Europe, please feel free to ask! Im in Scotland but Ive travelled through Europe and been to most countries so if there are certain places you know youre going, let me know and Ill see if I have any info for you!
As for your Mum, it sounds like she wants the control. It must be difficult to let go of that control and protective instinct as she wont be able to control you as much if youre away travelling in Europe. But that doesnt make it right or fair on you.
I agree with the others, youre an adult and you can make the decisions in your life.