Suwanni was born in Phitsanulok Province, Thailand.
Suwanni completed primary education at Phadung Nari-Kawi Phitthaya School (โรงเรียนผดุงนารี-กวีพิทยา) and secondary education at Chaloem Khwan Satri School (โรงเรียนเฉลิมขวัญสตรี) in Phitsanulok Province.