QUOTE(AmandaL @ Jun 8 2008, 10:27 AM)

Technique becomes important if you want your playing to progress beyond a level that would equate to roughly Grade 5. Without it, improvement will literally grind to a halt. This is why Grade 5 is often referred to as the 'glass ceiling' of string playing - pupils either lack the facility to learn the advanced techniques, or lack the tenacity to stick at it for long enough to develop them fully.
What sort of advanced techniques do you have in mind, and what sort of facility does one need (given the tenacity)?
QUOTE
If you are happy playing a few folk, baroque, or simple tunes which take you no higher than 3rd position, then you'll be ok, but if you develop the desire to tackle more complicated repertoire and succeed musically with it, that's when technique is absolutely essential.
I wonder whether you might be understating your case a bit here. Personally I'd be content to feel that after a couple more years I'd be able to play in the less challenging kind of amateur orchestra (the kind that only asks for Grade 5, if that), and I imagine a lot of adult learners would feel the same. Do you think it's possible to get even this far without tuition? I don't think I could. I'm not even sure I can do it
with tuition.
Laura, does your mum like
any kind of music? You can play jazz on the violin, or rock, or folk. And where would "easy listening" be without the cascading strings?
Maybe your mum has had experience of what a
beginner violinist sounds like? - which is of course what
you will sound like, for a while. But you'd think that, if she isn't going to stop you learning the violin at all, she would want you to get beyond the beginner stage as soon as possible!