。
She tied her hair with a ribbon.
Literal
[topic-は] ribbon [with-で] hair [object-を] bound.
束ねる ('to bind, bundle, tie up') is the standard verb for gathering hair, papers, sticks, or similar long thin items into a bundle. The instrumental で marks the tool used. リボン ('ribbon') is a loanword from English, carrying the everyday meaning of decorative ribbon used for hair, gift-wrapping, or trim.