That is possible if she independently meets the programme's requirements, and it is a separate application with its own vetting, not an extension of yours. She would pay her own non-refundable US$15,000 and make her own US$1,000,000 qualifying gift when instructed. Nothing requires her to already hold United States status.
Two files, one household conversation
If she files separately, her classification, chargeability and interview scheduling are decided on her own record, which can land ahead of or behind yours. Agree in advance who funds what, and put it in writing, because two applications drawing on one pool of savings can strain a household plan quickly. An already granted permanent residence is not cancelled automatically because a child later marries or turns 21.
The official FAQ describes a spouse and unmarried children under 21 as eligible to accompany the principal, each with their own gift and processing fee. Confirm the relationship evidence, each child’s age and marital status, any possible CSPA analysis, admissibility, and visa availability rather than treating a payment amount as the whole case. An included spouse or unmarried child under 21 needs separate identity, relationship, age, admissibility, eligibility, and payment review.
Following successful vetting, the principal gift is US$1 million individually or US$2 million per corporate employee.