Is it permissible for a girl to train men and women together in one place, while adhering to Sharia-compliant guidelines?

If you maintain your hijab, your modesty, and do not speak alluringly, and if men and women are separated, with women observing the hijab, then we hope there is no harm in that. However, if men and women are mixed and women do not observe the hijab, then it is not permissible for you to teach, due to the presence of objectionable behavior therein.