Answer (EN)
How often does Helen go (Helen/go) shopping?
Translation (RU)
Как часто Хелен ходит (Хелен/ходить) за покупками?
Brief explanation: The phrase 'How often' indicates a question about a habitual action. Therefore, the present simple tense is used. For a third-person singular subject ('Helen'), the auxiliary verb 'does' is used in questions.