Yes, if she is a specified student and she needs to be over 24 years of age to qualify for the EIC credit.
Yes, if she is a full-time student and age 21, she would not meet this requirement.
Yes, if she answers all of the questions for education tax credit the system would use that info to determine if she meets the qualification for this requirement.
Also, she has to answer the question that she is eligible to be claimed by another person. Since she is under the age of 24 and a full-time student she is eligible to be claimed, even if you are not claiming her. The keyword is "Eligible".
