Does a Will need to be updated if one of the beneficiaries gets married?

You only *need* to change it if you are making some change in the provisions--e.g. if you want to leave money directly to any grandchildren if/when she has them; or if you want the money to go to a trust for her benefit instead of directly to her, to insulate it from her new husband. If she takes her husband's name you could change the will to identify her by her married name as well, but that's just a convience for the executor, to make her easier to identify and locate her.