From an article about ADHD in women :

Does ADHD in women show up the same way it does in men?
Women and girls with ADHD are more likely to internalize symptoms and become anxious. Symptoms most often reported by women are dysphoria [unhappiness], inattention, organization problems and impulsive behaviors.

For men, it tends to be external motor activity; for girls it’s more fidgeting and twirling their hair. With females [you see more] hyper-talkativeness. They’re out of control emotionally.

From another site:
It is a misunderstanding that those with ADHD cannot concentrate and focus, because they often can. The difference is that they can intensely focus on what is of interest to them at the time (like swimming or video games) but have difficulty with subjects or tasks not of their choosing (like homework assignments on topics they don't like or group activities). They may feel overwhelmed when trying to organize and complete other assignments or responsibilities, leading to increased stress. In essence, they space out because of this overload.

This is in contrast to those without ADHD, as they are still able to focus and follow through with an uninteresting task without being distracted. They can organize, remember conversations, plan, socialize and balance, even when stressed by multiple assignments or life needs.