All perfect praise be to Allaah, The Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad , is His slave and messenger.
This is a good inquiry and the ruling is that no Zakah is due on jewelry that a woman owns for adornment. The fact that the woman intends to sell some of it should she need money does not mean that she owns the jewelry for the purpose of saving it. This is the same as someone who bought a car to drive or clothes to wear and then sells them out of need. Even if we take your words for granted, what actually counts is the original purpose for owning the jewelry. Any accidental or secondary purposes do not affect the original ruling.
Allaah Knows best.
*Helped by fatwas of islamweb.net