What is "sandraudiga"

Sandraudiga is a Germanic goddess, attested on a stone with a Latin inscription, found in North Brabant, the Netherlands. Today the stone is housed in the National Museum of Antiquities, Leiden, the Netherlands. The meaning of her name is still subject of discussion, but it has been suggested that it might mean "she who dyes the sand red". Other indigenous (southern) Dutch deities who are locally known at that time are: Vagdavercustis, Burorina, Hludana, Viradectis, Hurstrga, Nehalennia and Seneucaega.