I asked a girl if she wants to be FWB

OK I need a 2nd opinion from whoever reads this. I asked this girl that I went to school with if we could be friends with benefits. She said that she would think about it "for a sec". I said "cool, take your time no pressure". Well it's already been a day and no response. I even asked her if we could meet face to face to talk about it but she only read the message and didn't respond. So does that mean she doesn't want to be FWB and I should probably look somewhere else or should I wait it out?