I would not worry you need to just be patient. USCIS can take some time depending on what type of petition you submitted. You can always check the status of your petition on www.uscis.gov website or you can call the phone number on your receipt.
It really depends on what you applied for. Did you apply for deferred action for childhood arrivals (DACA) or some other benefit. I will say that we are seeing DACA cases approved this week for filings from September 11-15 with fingerprints taken in early October. Therefore, if its DACA you shouldn't worry. No matter what the process, you can track the case at www.uscis.gov.
Nothing seems to be out of the ordinary. daughter should be getting her interview notice anytime soon, from a few weeks from now to a few months.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.