When she has previous earnings from her own work from before marriage, does this also belong to the the husband now that they’re married?
Without knowing the situation, and what you are referring to, the general halacha would be that the money that she earned before she got married would be called “nichsei melug”. The basic halacha regarding nichsei melug is that the money belongs to the wife, but the husband gets the profits. The classical example of this is a field that she owns prior to the marriage, that the actual field belongs to her, but the fruits that grow in the field are the husbands.
This is a simplified guide, and should not be relied on without first consulting a Rov.