not enough info
she needs to sit down with the priest when she is first beginning her confirmation preparation, or with the person he delegates, and discuss her situation.
short answer: a baptized but unconfirmed Catholic who is divorced but has not remarried and is otherwise in the state of grace (sacramental confession and absolution) is a candidate for Confirmation.
However, and it is a big one, if you came to me I would strenuously advise you to proceed with annulment unless you were much older and had no intention to remarry. No, strictly speaking the annulment is not required but almost every year there is a candidate who is confirmed, swears they have no intention of remarrying, and within a year has married outside the Church and is now barred from the sacraments, and this is simply heart-breaking.
I would as part of your preparation have you meet with the deacon or priest to make sure you have good pastoral counselling regarding your marital status because there are so many variables outside my competence. You would sign a statement that you had received this advice and understand remarriage without annulment is impossible. As part of our Confirmation class we have one session where the deacon teaches on marriage, and stays after to be available for individual private questions.