It is a common Spanish phrase that describes a woman who has recently come to a place or situation. It can also be used in a more metaphorical sense to describe someone who has made a strong impact or changed things in a significant way.
For example, it could be used to describe:
* A new neighbor: "La mujer que llegó al barrio es muy amable" (The woman who arrived in the neighborhood is very kind).
* A person who has changed their life: "La mujer que llegó a su vida le enseñó a amar de nuevo" (The woman who arrived in his life taught him to love again).
* A new product or idea: "La mujer que llegó al mercado revolucionó la industria" (The woman who arrived on the market revolutionized the industry).
The exact meaning will depend on the context in which it is used.