The Austin-native started riding at the age of nine taking lessons at Houston's Parish Stables, a hunt/jumper barn. By the time she reached high school, Manroe was teaching as well as taking lessons between shows. In college at the University of Texas, Manroe joined the Longhorns' Canter Club and rode under the instruction of Jane Burr at the Hobby Horse Stable. By the spring of 1968, Manroe was teaching regularly and has been an instructor ever since.
Presently, in conjunction with the time spent with Baylor riders, Manroe trains riders at Phoebe and Glenn Johnson's SwitchWallo Stables. Her students have successfully shown at local and state levels, earning year-end awards in hunter, jumper and equitation divisions.
Manroe previously served as the past president and parliamentarian of the CenTex Hunter and Jumper Association and is currently Director Emeritus. She has also produced horse shows since 1984 specifically for the Central Texas Summer Circuit, a three-show circuit in Austin recognized by the Texas Hunter and Jumper Association and the CenTex Hunter and Jumper Association.
Additionally, Manroe judges hunter and jumper shows locally in Austin as well as trains and sells young horses in the hunter/jumper market.
Manroe has been married to Joe Maxwell for 37 years. The couple has a 27-year-old daughter, Amanda Maxwell Sikes.