While Vice President of the Educational Testing Service Social Investment Fund, Horne created and led a strong community and philanthropic presence and enduring collaborations locally and nationally with organizations committed to educational equity and access. She is now a full-time volunteer leader actively engaged in organizations committed to education, expanding social justice, and enhancing communities. She serves as Co-President of the Lawrence Hopewell Trail Corporation and is an active member of the Circuit Trails Coalition Justice, Equity, and Inclusion Task Force.