@zensluv sorry for my late response, I havent been online in the forums the last few days ?
I did nothing special. I just did her "normal" activities, in her case it was dj-ing and singing, oh and producing music and eventually I reached the next star, but it took me hours. To gain fame without acting really takes a lot of time and patience.
But what I noticed with some other sims, for example my painter; the fame decay is faster that gaining fame with just painting one or two pictures a day. He has to paint A LOT! and sell the pictures to gain fame.