Once your wife's I-130 is approved at USCIS and forwarded to NVC you will be in a better position of getting the expedite approved for the daughter's petition because of her mother's approved petition creating a potential family emergency, which is one of the grounds used to determine eligibility for expedites. You will have the ability to control the speed of the process at NVC, because they have to wait on you and your wife to complete and send all the required documents for processing to continue. The approved I-130 for your wife never expires ( the fees and some documents do though after 1 year) If the daughter's I-130 is expedited and then joined with her mother's I-130 then they will interview together and hopefully receive their visas together. You should make it very clear in the expedite request that the mother has sole custody and leaving her behind is not an option. You are the one that needs to delay your wife's processing long enough to allow the daughter's petition to be approved and forwarded to NVC to be joined with her mother's case. Once the cases are together at NVC then opt in to the electronic processing. With the cases joined together you will only have to pay 1 AOS fee, but you will have to pay every fee for the daughter that you pay for the mother. ie... IV fee, medical, EMS fees. I hate to mention this as a reason also, but if for some reason her mother's case is not approved at USCIS then you will have lost another 420 dollars by sending in the daughter's I-130 petition since her petition will be denied also. I am listing the guidelines USCIS uses for determining expedites.
Please keep in mind that expedite requests for applications and petitions will be considered based upon the following criteria:
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Severe financial loss to company or individual
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Situations of extreme emergency
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Humanitarian situation
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Nonprofit status of requesting organization advocating the cultural and social interest of the United States
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Department of Defense or National Interest Situation (Note: Request must come from an official U.S. Government entity, stating that delay will be detrimental to the U.S. Government.)
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USCIS error
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Of compelling interest to USCIS
I high-lighted in red the reason your expedite may be considered. Best Wishes and Good Luck, Robert