Shes like talking to a brick wall

I’m a (25M) I’ve been talking to a (24F) for like a week and a half. We’ve had three dates so far, we had sex on the second date, the sex was by far the best I’ve ever had. I’m really into her but talking to her is like talking to a wall. Like I’m talking three word responses. It’s a bit better in person but barely. She responds with “I don’t know” a lot. I don’t wanna seem like I’m like interviewing or interrogating her, but she doesn’t ask questions back. Like the way these conversations go I can’t even tell if she’s into me, but like I know she definitely is. We went out for breakfast on Sunday morning and then we made out after. But then we text each other throughout the day and it’s just nothing. Is this a compatibility issue or something?