"Please find the answers to your questions below:
1. No explanation is required, your spouse will only have to use your daughter's birth certificate to prove the relationship.
2. File a new I-485 with your ex-hu*****and's I-140.
Should you have any further questions, please do not hesitate to contact us.
Sincerely,"
I agree that transferring/ relinking her 485 is a better choice
Thanks