She says she's not feeling well?

I'm supposed to be going on a second date with a really nice girl I just met earlier this week. When I asked if she was still down to go on our date she told me she "wasn't feeling herself" but also suggested to reschedule the date a couple of days from now. I've been getting mixed signals with her and I'm not sure if she's interested in me or not, or perhaps she's unsure. Can I get some help here?