The incident occurred around 4:20pm on Glebe Street in Ballinrobe.
The victim was originally taken to Mayo University Hospital but later died from the injuries she had sustained.
Garda have asked that any witnesses or anyone with dashcam footage from the area contact the Gardaí at 094 9372080 for Claremorris Garda Station , the Garda Confidential Line on 1800 666 111.
