Is she not able to get out of her own head?

So I met this girl online. We talked everyday for 2 weeks. We have a great connection and similar upbringings, humor, values and wants. She keptmtelling me how excites ahe was to meet and how muchnshe liked me. We went on first date and everything was amazing. After first date we did sleep with each other. Nothing was awkward and the constant talking continued. Had a second date (Netflix and chill this time). Again everything was great, slept with each other again. Now though she is getting distant. Not talking as much and doesn't seem as interested. I have made an effort to not be clingy and not spill how much I really like her and want this to progress. I thought we were on same page with liking each other. Is this a case of her just not able to get out of her head, or might there be another guy or something I did? Any advice would be appreciated. I don't text her till she texts me so I'm not over bearing and I try to keep conversations light and fun. Should I bring up myconcerns?