Most Ashkenazim Gedolim say that it’s muttar to wear sheitels. Someone wrote to Rav Chaim Kanievsky shlita about it (she wanted to know if she should stop wearing her sheitel as a zchus for Am Yisrael), and he wrote back that it’s not a problem for Ashkenazi women to wear sheitels since the Mishna Berurah says it’s fine.
He also added that if she wants to do something as a zchus for Am Yisrael, she should daven maariv every day.