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Thanks for your reply! Sounds like she has not aged-out. The law firm hired by my company does not seem to know how to handle this kind of complex case. That's why no I-824 was filed.
I just googled about I-824, it seems that in order for a child to be eligible for "follow-to-join", s/he must be from a marriage that existed at the time of my admission to the U.S. My daughter is from my previous marriage that ended 18 years ago.
-"Following to join" has different kinds of cases, and your child is one of them. It means "your child follow you to join to get her green card because you got yours before she applies for it". She should have applied for her green card together with yours, but she still has the same benefits now as long as she has no age-out yet.".
So, you need to file I-824 now to freeze her CSPA age. I-824 filing is irrelevant to your company, but you need to provide a copy of the I-140 aprpoval notice, and the copy of your green card (read the I-824 Instructions).
Is she still considered eligible for "follow-to-join"?
-Yes.
Thanks again!