She is also a member of the Lands, Housing and Physical Planning committee; Agriculture, Livestock and Fisheries Committee and Justice, Legal Affairs and Public Service Committee.
Hon. Wanjau holds a Diploma in Business Management from Universal College Nairobi and a Certificate in Community Health and Social Work from Medical Missionary of Mary College.
She went to Bomet Primary school and Kaplong Girls High School in Bomet County.
Before she ventured into politics, Hon. Wanjau was the Chairlady for Consolata Rehabilitation Programme in Nairobi, an organization that engages in women empowerment and alleviation of suffering among street families.
She is a staunch Catholic and serves as the Assistant Chairlady for Catholic Women Association in Mulot Church in the Diocese of Ngong.