Very confusing what you are trying to say here. Did a random woman approach to you to buy bitcoins and you pointed her towards a "legit" vendor? She bought bitcoins from that "vendor", and you received a comission from that vendor for referring her to them? And also the woman gave you 50k  because she was happy? This all sounds like some made up story to me. Even if it is real, make sure you teach her how to keep her funds safe, because when she loses all her money, she is going to blame you.

Great that you invested those money in bitcoin. But your "money" isn't disappearing. You still have the same amount of bitcoins that you bought. It's only value that is going up and down. As long as you don't sell, you don't lose any money yet.