The boots in the pic are lovely, although the heels are a little heavy.However I suppose it depends on your age.I would wear those with jeans but over skinny jeansOr with a skirt, short rather than long. If you wear a just above the knee skirt, with a smart-ish top (don't try to go too goth), they will look fineThey aren't stylish (which is what I assume your mother means by 'classy'.A word to your Mum, so long as you (the daughter) are not dressing in a tarty or inappropriate manner, I'd let you wear what you have. However, maybe the boots aren't suitable for going someone where smart clothes are required.One word in your Mum's favour. If you are still rather young, the heels are not good for your body.Try to find a compromise between you. Why don't you ask her to help you find an outfit. Don't get huffy with her and ask her to consider your likes and dislikes. You never know, you might have fun.