My Daughter having sex

So im only 15 and my mother and I were talking about sex and she asked me how would I stop my daughter having sex. I answered to her surprised answered: "I wouldnt I would say come to me about it so we can talk first and if u really want to have sex then I will give u advise and a packet of condoms and I will leave u two alone in the house for an houor two as long as u text me when ur done but u must both be there after" she said that was ok in a way of an idea but she wont really look or talk to me in the same way and I dont know what to do