<human>: Could you distill the essence of the text into 1-3 sentences?

I met a girl about a month ago. Instantly hit off and even got down and dirty on the first night. We've talked everyday since and usually hang out 2 times a week, going out, sleeping over each others houses etc. When we're hanging out in person, she's great; all over me, nothing but smiles, always talking and seems happy. 

But outside of that it takes her hours to respond to texts. On Friday we were supposed to go out but she never texted me until 11 at night after we had plans, saying she had to work longer, even though her job she is allowed to text at. The next day, she only texted me twice all day. Once when she woke up, and a random 1 word message Hi around 10 at night. Then today, expecting a text from her like usual when I woke up, there wasn't one. I text her around noon simple asking Are you free tonight, to which she responds she ha to get up early tomorrow. So i just said She's hard to make plans with, let me know a day your free. Haven't heard from her since.

Its really hard for me to discern her intents here - she says I give her the best physical relationship she's ever had and as I said she's wonderful to be around in person, but the lack of communication outside of being in person kind of throws me a curveball. If I care about someone I couldn't go a day without talking to them or trying to make plans with them, so I'm assuming she's losing interest but it is hard to tell after only a few days. I just need some help sorting out the mixed signals I think. If she doesn't want to pursue a relationship with me or is losing interest, just let me know, don't just make me think your happy then disappear…

How do I go about this? Just wait? Or try and talk to her about it (if she answers)?
<bot>: Met month ago, great in person, but barely talks outside of face to face even to point of going 2 days of saying almost nothing and not making any effort to see me.