Why is she suddenly being silent?

Anonymous
So I met this girl online in early October, we started talking and ended up having a lot in common. She was living in Michigan at the time, but was moving to Florida in December, so was looking for people in Florida. We had so much in common, flirted a lot, and we even had a conversation where we tried to scare each other off with stuff we thought would turn the other away, and we came out even more attracted to each other. We talked every day, whether through email, or text, or skype. She would almost always text me first too, normally like a "Hey youuuu :)"

She finally moves down at the beginning of December, and I travel up to meet her (she lives about 2 hours away, and knew this from the get go). We had a fantastic date. Started as minigolf and chinese, and ended up going to the beach under the moonlight, having coffee at starbucks, and since we didn't want to leave each other, we watched a movie at her place, and we ended up cuddling and making out.

She continued to talk to me after that, and agreed to another date on the 22nd, and to come down to me and spend New Years Eve with me. When our 2nd date was approaching, she would send me very flirty texts, implying she wanted to "get physical", and was excited to see me.

The day before the date I asked her if we were still on, and she said "Yep!" and was very excited, but canceled the next day because something came up that she had to do. I asked her if she would be able to go out the next night, or knew when she would be able to go out next. I never got a response.

Ever since then she's been ignoring me. I've sent her a text asking to talk, which never got a response, and a text on Christmas to tell her Merry Christmas that didn't get a response either. I figured she needed some space, for whatever reason. So I laid off for about a week, and sent her a text today, just a friendly "Hey, what have you been up to?" and never got a response as well.

Things were going very well for us, she was into me, I was into her, and we got along fantastically, so why all of a sudden did she go silent? How did she go from sending me flirty, borderline sexting, texts on Friday, to ignoring me the following Wednesday and every day since?
Updates
+1 y
UPDATE: She texted me 2 days ago, saying how she's been super busy. We have talked for a little bit yesterday, but she couldn't come down like we had planned. She doesn't seem as "excited" to talk to me as she used to. Not sure if she's still interested
Why is she suddenly being silent?
2 Opinion