While you are spending UE on charisma, you won't see your shortdesc change just from the change in the stat until you do something else which changes your shortdesc -changing the clothing item which is spelled in your shortdes, or, changing your identifer ("@shortdesc change", words like girl, chica, woman, etc.)
Many's been the time someone over-invested in charisma and unexpectedly went past the investment necessary to change the sdjective because they didn't immediatly see it when they exited "@assign ue" and tried to look at themselves to see if they has picked up a new adjective.
Also, having high charisma alone is not sufficient to get those shortdescs. Charisma is divided into two substats, appearance and charm. Your appearance substat has to be high enough to meet the level for the next step up on the 'attractiveness scale'. Two people with the exact same level of charisma may have different shortdescs for how they look.