.. Figurine

So, we are talking about an old item. Over 2000 years ago, I would say.

And a woman with a large disc or orb over her head.
And the orb is surrounded by horns, like cow horns.

It must be the sun.

If it is an old figurine and sun, it must be some kind of sun goddess.
So, golden sun goddess from an old civilization with horns around the sun.

How about a goddess named Isis?

Isis is part of Egyptian mythology. Take the figurine to Cairo, Egypt.