Unlike Gilda Broscoe, Magnolia is a synth, meaning she very much looks human. Like Gilda Broscoe, Magnolia is not a companion. During the quest Brain Dead, the player will encounter Gilda and can eventually flirt with her.
Before the bombs dropped, Gilda paid for a place in the ultra-exclusive Vault along with her love, Keith McKinney. Gilda Broscoe was once a beautiful and famous actress before the Great War. The world may have ended, but people are still looking for love. The Commonwealth of Fallout 4 is no exception to this rule.
At some point, you will need to foster a relationship with your companions in order to reap the best rewards from your companions.