Why does she flirt a ton in person but suddenly ignore my texts?

I have this chick I know from being at a golf course we both play at, she just joined this year and her parents play there. I noticed her all year staring at me and never coming to say anything, but would always stare. About 2 months ago I broke the ice and started conversation, got to know her, added on Snapchat, followed on social Media all the basic stuff. As I said, she has been extremely shy, but I have heard from other people she was extremely interested in me, including her parents who "highly approve" of me. 2 nights ago she was having some drinks and we danced, sang karaoke, talked for hours, I can tell 1000% her interest is there. Had 4 people come up and said she mentioned to them she is in "awe" of me. Mind you, this female is 24 and smoking, I am 31 and about 300 pounds, not something I am used to. I asked for her number and she gave it. She mentioned she wanted "A night out with me". I texted her 1 time so far and she has not responded, it has been a day, she has also stopped snap chatting, we used to all day long. Just trying to get a sense here from others what is going on. I like this girl, she is my type and honestly it's the first time I have heard from multiple people that someone is interested in me.

what do I do here to not mess this up and hopefully get a date going or something. Her birthday is coming up next week and I would love to take her on a 1st date somewhere, but with the no text response and leaving me in the dust since we had a fun night, I'm lost.

Why does she flirt a ton in person but suddenly ignore my texts?
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