Under King Cnut, the abbot of Canterbury, Aelfstan (elf-stone) claimed to have had a dream where St. Mildred came to him wanting to be buried in her home town. He claimed to have gotten permission from Cnut to take Mildred from her tomb on Thanet and translate her to Canterbury. If that is the case, why did they have a getaway boat by the shore and snuck up to her tomb at night to pry it open? The townspeople, when they realized something was up, chased after them with clubs and pointy sticks. They got away with the body, which apparently smelled delicious. There is a term for this kind of action 'furta sacra" or sacred thefts which shows you how common this kind of body-snatching was.
Grave robbing is grave robbing, however way you rename it. Of course owning the relics of a popular saint was like money in the bank but I am not going to accuse the abbot of being mercenary. Surely it was piety that drove him to this action. Another thirty years and Anglo Saxon saints would probably be out of fashion anyway. The Norman Conquest would be underway and French would then be the fashion. So where is her body now, since following the dissolution of the monasteries the relics were dispersed or thrown away? Possibly they were taken to Deventer in Holland for safekeeping. Although the saint 'desired' to remain in Canterbury, she did not make it back however a small piece was given to St. Mildred church in 1953. It is complicated. Here is a link.