她骑电动车用英语可以说 "She is riding an electric bike."
来源：
"ride" 在这里作动词，表示骑，例如：I often ride my bike to work. (我经常骑自行车去上班。)
"electric bike" 是 "电动车" 的直译，是指使用电力驱动的自行车。
一些英文例句及其中文翻译：
She loves to ride her electric bike on the weekends. (她喜欢在周末骑她的电动车。)
Electric bikes are becoming more popular in the city. (电动车在城市里越来越受欢迎。)
He is thinking about buying an electric bike for his daily commute. (他正在考虑买一辆电动车来日常通勤。)