Friends said Jen Jones, a Spring Lake Township resident, was driving a mo-ped to her brother's house.
They followed some distance behind and came upon her mo-ped in the road on a curve near Reenders Street at about 9:50 p.m.
They found the unconscious woman in the grass nearby, they said.
Spring Lake/Ferrysburg police said the woman was headed into town when she apparently lost control of the mo-ped, scraped along the curb and dumped the bike.
No other vehicles were involved, police said.
Jones regained consciousness and talked to emergency personnel before being taking by ambulance to North Ottawa Community Hospital as a precautionary measure, police said.
The mo-ped was impounded.
Police said alcohol was a factor in the crash and that the woman would likely be ticketed.