New girlfriend struggling to catch feelings while admitting everything is perfect. Advice?

Started dating a girl over the new year everything is great. We talk we laugh we go out do stuff. We get along great and sparks fly when we're intimate. By her own admission the sex is amazing.

But then she says to me "she's worried that desires me physically more than emotionally and can't see to catch the same feelings she once had for her first love".

I'm generally good with women but this one was a situation I couldn't understand.
We're still together but I fear we're hanging by a thread and I don't know what to do, it doesn't seem I'm doing something wrong or lacking something but I can't "make" her catch feelings.
New girlfriend struggling to catch feelings while admitting everything is perfect. Advice?
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