You made a big mistake to become a US citizen before your daughter gets the green card, thus she has lost the qualification for the following to join benefits of the I-140. You need to file I-130 for her, which takes a long time for her to immigrate into US. No choice.
The following is the relevant information I cited from the USCIS webiste for your information ( I highlighted the related information with blue color to your case). Although this rule is related to adjustment of status within US, it also applies to the immigrant visa application outside US.
This is the link:
Chapter 6 - Adjudicative Review | USCIS
2. Qualifying Family Relationship Continues to Exist
If the applicant claims a family relationship on the immigrant visa petition, that relationship must remain intact until a decision on the adjustment application, in most circumstances.[5] The officer must confirm that the applicant remains eligible to adjust status based on the relationship claimed on the underlying immigrant visa petition. Failure to maintain the relationship disqualifies the applicant in most cases or, if not disqualifying, may be a negative discretionary factor in certain types of cases.
The officer should review documentation to establish that the relationship continues. This review may include Child Status Protection Act (CSPA)[6] age calculations to confirm that the applicant remains a child by definition.[7]
In cases of derivatives following-to-join, the derivative’s qualifying relationship to the principal applicant must have existed when the principal beneficiary obtained lawful permanent resident status and continue to exist through final adjudication of the derivative’s adjustment application for the derivative applicant to remain eligible.[8]
If the principal beneficiary becomes a permanent resident and loses his or her permanent resident status or naturalizes prior to the derivative’s adjustment, the derivative is no longer eligible for the classification as an accompanying or following-to-join family member.[9] Furthermore, a derivative may not be granted permanent resident status prior to the principal beneficiary’s obtaining permanent resident status, because the derivative has no right or eligibility for the classification apart from the eligibility of the principal beneficiary’s status, with the exception of U nonimmigrants, asylees, and refugees.[10]
