Well you could always do exactly what you know she wouldn't want. Just take note that women don't respond to full-on fisting without proper notice.
Give her time and she'll probably warm up to being vocal about what she she likes. You're gonna have to bear in mind that a person is never as vulnerable as when they're nude - and I'm sure you can imagine the feeling of vulenerabilty when allowing someone to enter your body.
You could talk to her about it but if she's not completely comfortable telling you what she wants she probably not going to be comfortable explaining why she won't and so the situation will be complicated further.
Give her time - open up to her and hope for the same in return.
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"Porn is a zoo of exotic animals that becomes boring upon ownership." -Nersesian
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