Azi, I was just wondering. How big of a tzadik are you that you think you should be talking to your mother about her tznius level? Do you think you are that much better than her? How is YOUR tznius level? Do you shout in the streets? Do you jump lines in stores because you are in a rush? What is your learning level, sinse you are such a tzadik? How often are you in the bais medresh? Do you pick up a sefer even bain hazmanim or just when it is in your way?
When you will get married, your wife can wear what ever kind of a tichel you want or if you are a girl, you can wear as heavy a tichel as you want, but I think your mother’s ruchnius is NOT YOUR BUSINESS.
Worry about your avlahs not someone elses.