Let me make it even easier.
If the I-94 for her H4 status remains valid, then she can still be in H4 status until such time that the divorce is finalized.
So before the divorce is finalized, and before the I-94 expires for her H4, she can apply for a change of status. This is true even if she has an EAD. Now if the I-94 has expired, and she still is in the US, then this is not possible. She has to move forward with the Adjustment of Status or otherwise leave the US.
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