The Child Status Protection Act of 2002 (CSPA) provides some sort of relieve to derivative beneficiaries of DV lottery selectees who could potentially loose eligibility for immigration derivative benefit as a result of turning 21. To calculate eligibility for children in this category, DOS uses the period between the first day of the eDV application (in this case Oct 1st 2012? not quite sure of the exact date the 2014 eDV application was open) and the date the principal applicant was notified of their selection (May 1st, 2013) as the "petition pending period". This period will be subtracted from the beneficiary's age on the date the principal applicant's CN becomes current.
Based on the information you've provided Roselyna, it looks like your daughter could be covered under the CSPA Act. There's roughly 242 days between when the eDV 2014 application began (in Oct 2012) and when selectees where notified (in May 2013). Your daughter turned 21 on Oct 2003, the number of days between when she turned 21 and when your CN becomes current is roughly about 120 to 130 something days (somewhere in between). This means she would have been 21 for less than 242 days by time of your interview and she still qualifies just like Simon posted earlier. You may want to go through the following document (page 6 to be precise) for a better explanation of how the calculation works:
http://www.wolfsdorf.com/articles/DV_Article_2004-05.pdf
Is your daughter listed as a derivative on your IL though? You should also contact KCC for a better clarification of what is going on with your case. I would suggest you print out this article also and take it along to your interview as something to use in presenting your case if indeed your daughter is being left out based on the assumption that she's aged out.
Actually Simon, they sort of "freeze the age"
, but not based on when the forms were returned to KCC. The CSPA formula for such cases is that the child's age will freeze as of the date that a visa number becomes available for the petition in question reduced by the number of days that the petition was pending.