Why does she do this?

I've been talking to this girl, we are both virgins we sext and other things like that, But i make sure she is okay with it before we do anything and sometimes she starts it, but when I being up the topic of having sex with her she tells me she feels pressured. I tell her I will follow her lead whenever she feels comfortable. But she sends me mixed signals when she suggest having sex with me herself talking about wanting me inside her etc. But when I bring up the actual subject at hand she says she feels pressured eventhough she has told me she really likes me and we do all those other things.
Why does she do this?
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