Signs that she wants to take the relationship farther?

My girlfriend and I have been dating for about 2 months now and are getting along great. We both love each other and really want it to be a long lasting relationship. Because of that, we have been taking things very slowly. She is a shy girl though, so I have a hard time reading her.

Couple nights ago I gave her a simple kiss and she remarked that I need to do it longer and use the tongue, which caught me off guard. She'll also sit on my lap sometimes, but that's as far as we've taken it.

I have a hard time reading females as to if they want a relationship to speed up or slow down. The hardest part is with a shy girl even if you ask her, she'll say it's going just fine.

Suggestions on reading a female?
Signs that she wants to take the relationship farther?
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