The school said their behavior was detrimental to school values.
Police say they want to find the artist.
The mother and daughter have been supported by Mayor Jacob Frey.
They painted "666" and "Jesus saves" on the outside of the mosque.
Nearly 30 reports of vandalism to homes and vehicles.
They have all been charged with burglary and damage to property.
The Fillmore County Sheriff's Office is investigating.
The culprits may have used a BB or pellet gun to cause some of the damage.
Officials say it's "highly likely" that someone in the community has information.