Generally no. Derivative eligibility in employment-based immigration reaches a spouse and unmarried children under twenty-one, so an adult child of twenty-two ordinarily needs her own basis rather than being added to a parent's case.
Adult children need their own route
This is the question households get wrong most often, because a twenty-two-year-old living at home feels like a dependant in every ordinary sense and is not one in this sense. Establish it before any money moves, since discovering it afterwards changes what the family gets for a payment that is not returnable. Her realistic options are separate: a student route with its own admission and financial requirements, an employment-based route with its own qualifying position, or a family-based route with its own waiting period, each assessed on her own facts. Where a younger child is close to twenty-one, the same arithmetic should be done with real dates, because reaching that age during processing has consequences. Confirm the current family terms against the official programme materials, which may address joining family members specifically.
Hypothetical example: An import-business founder plans to apply while a spouse has a prior marriage and a twenty-year-old son is financially dependent. The first review should identify each family member separately and match the person to the current programme and immigrant-category rules. Marriage certificates, divorce records, birth certificates, and passports settle relationship history; financial dependence by itself may not settle immigration eligibility. The applicant's personal gift payment does not automatically include every household member. Gold Card is not a conventional visa category, so do not assume derivative rules from a familiar temporary category apply unchanged. Obtain current official confirmation before payment if inclusion of any family member affects the decision.