There are a few reasons why a Libra woman might be nice and friendly one day and then seem cold and distant the next.
One possibility is that she is simply trying to maintain her balance. Libras are constantly striving for harmony and equilibrium in their lives, and this can sometimes mean putting on a different face for different people or situations.
Another possibility is that she is feeling overwhelmed or stressed. When Libras are under pressure, they may withdraw or become defensive. This can make them seem aloof or even hostile.
Finally, it is also possible that the Libra woman is simply not interested in the person she is interacting with. Libras are very selective about the people they allow into their lives, and they may not always be forthcoming with their feelings.
If you are interested in a Libra woman, it is important to be patient and understanding. She may not always be as warm and friendly as you would like, but she is worth getting to know.