After a girl confesses that she likes you, why would she become distant towards you?

Cipher5
Become distant towards you? I.E. - communicating less, not as available, taking longer to respond, etc.

Yet when you do manage to talk she is still flirty and acts like nothing has changed.

So confusing and stressful, is this something to talk to her about or express my concern or just back off perhaps? (I only try and communicate with her every 2-3 days unless she comes to me) Or does she maybe feel like that now having confessed how she felt, she feels like she is no longer a challenge and wants to go back to that?

I really just want to tell her how I truly feel about her, how I admire her dedication to school/work, how I get butterflies every time I see her beautiful smile or how I have never experienced chemistry with someone else like I do with her. (I've told her I liked her after she confessed to me, but besides then we haven't really talked about it again) Is this a good idea?
Updates
+1 y
Also we have been on a number of dates (hiking, dinner, etc) and things couldn't have gone better. Chemistry is perfect, just confusing why things have slowed down after we told each other how we felt.
After a girl confesses that she likes you, why would she become distant towards you?
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