Police say a Nissan Maxima was approaching the intersection of Lena Avenue in Freeport when it struck the three victims. Police say the driver wasn't able to stop in time.
The 39-year-old mother suffered a head injury, her 13-year-old daughter injured her back and her 8-year-old daughter may have a broken leg.
The mother was taken to the hospital in serious but stable condition. Her daughters were also hospitalized; they are expected to be OK.
No charges were filed against the driver.