Volunteer tutor needed: mathematics for a motivated student in Derry

My younger sister, Lauren, is 17 and in the final year of school. Lauren loves school but mathematics has been a struggle since the school was closed during the strikes. The school-leaving exam is in November. We can't afford a private tutor, and the school's free sessions are full. We're looking for a volunteer who could spend one or two hours a week, in person in Derry or online, for about twelve weeks. Lauren is polite, hardworking and eager. We have a quiet space and a laptop for online sessions. I'll always be at home for in-person sessions. If you're a teacher, student or professional who feels comfortable in mathematics, you could change the course of Lauren's year. I never thought I'd be the one asking, and I'm grateful for every bit of support.