ANSWER:

It’s not permissible at all for you to visit her as she’s not your mahram and this counts as free mixing which is forbidden. 

I am 21 yo male & back in my high school time, the one who introduced me to manhajul salaf was my female muslim teacher. I owe a lot of things to her. She has no husband and lives alone in her house. So, my mom & I will visit her every month/year. Are there any etiquette and restrictions that I must observe when visiting her?

Halal/Haram Matters, Mahram |