Phasma has a secret life. She disappears during her permitted leave times, and no one knows where she goes. There is of course a lot of speculation, but none of it gets close to the truth.

Phasma (out of her armour and under another name of course) is one of the most popular 'torch song' lounge singers in the galaxy, and no one has made the connection between her delightful surprise live appearances on random planets and the location of whichever ship she's serving aboard. Yet.