Tanya, Donna and Rosie form the girl band ‘Donna and the Dynamos’ and perform in ‘Mamma Mia!’ at Westfield High. From left: Isabella McDonald, 15, a Haymarket resident and rising sophomore at Colgan High School, then Lili Williams, 18, a Leesburg resident and graduate of Heritage High School, and Alison Brown, 18, a recent graduate of Westfield High School.