Great date, died at the end

I do the perfect chat game, get her to drinks, we talk about a lot of common interests. We talk about bdsm, sub/dom, fantasies. She is a bratty sub who wants to be tied up but doesn't like pain. She's inexperienced and wants to try shit. She asks some extreme stuff I did, and I explain in detailed way. She mentions that she's into rapeplay. We get out of the bar, go somewhere dark and make out and grope each other for a while. I felt like I could go for more right then and there, but decided to take her home instead. She says, she doesn't go home in first dates, I responded by saying today you're going to have a lot of first experiences. Anyways she asks me to walk her home, I'm like ok, we're close, she's in my arms. She mentions rapeplay again on the way. I'm thinking, "Does this girl wants to get force dragged back to my place or what?". Because I have met a girl who is into rapeplay who literally told me that before, but wanted me to figure out that she wanted to be dragged. I decide that is a bad idea, I do not wish to spend the night in jail if I misread the situation. Anyways it's going fine, we're chatting, she mentions her ex relationship of few years, I mention my ex marriage and I explain a bit more detail than I should've. I feel a bit awkwardness and then she says, "You know what, you don't have to take me all the way, I can walk by myself after this" I'm like, "I came half the way, might as well complete it" She insists and I ask "what's up did my marriage mentioning did something?", she says yes, kind of. And adds, "I'm not sure what I'm looking for so, you know I should just get going". She says goodbye in a manner that meant good luck in life and future. I'm curious if you guys had an experience like this. I took a for sure eventual victory and messed it up. I sent her a 2 pretty good follow up texts at the end of the night and day4. She hasn't blocked or unmatched me either. On day 13 I sent her the text in the image and get a response. So I need 2 things from you guys, What parts did I mess up, how could I not mess those up in the future? Is there any way to leverage and save this one? I was thinking of sending a picture of a girl I tied up to bed and spanked her ass into redness and write "This could've been you.." Go for it or skip?