Why would she talk to me excessively for weeks then suddenly stop?

ScottB96
Here's the story: Met this 22f on Bumble almost a month ago and instantly hit it off. She gave me her number that same night with snapchat the next day. Was going so well I asked her on a date two days after receiving her number. We go on our date with everything going so well we even kissed. We immediately started talking about what we would do for a second date. A day later she was already talking about me going to her place to make out, to which I noted I was interested in doing that. (Keep in mind she's a nurse that works 12 hours night shifts.) I mentioned I could come over Sunday morning and we could nap together (nothing else besides maybe making out). She was super exited about it all the way up to that morning when she backed out saying she wanted to still talk but take things slow which I completely agreed with. So the week goes on and we continue to talk.
One day during the week she mentions having me over to put aloe on her after sunbathing which she then walked back on but later that night sent a picture of her lower back area. We even have hour long phone calls at night and occasionally on my way to and from work (even before this week). One night over phone she brought up getting married and if I was okay with that which I was and she even mentioned what our kids would look like. Another night she brought up sex and talked about how she thought about it with me and I replied the same way. After that point I felt confident with where things were heading until a few days after that we barely talked and now she completely ignores me.

Long story short: Why would she tell me that I make her feel gushy inside, bring up what our kids would look like, marriage, sex? Pretty much fill my head with all this stuff to make me feel secure and emotionally attached just to drop me without warning?
Why would she talk to me excessively for weeks then suddenly stop?
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