You turn to Barbara and put her under your spell. Alexandra immediately freezes. "Barbara, describe your DND character," you say.
"She is an elven mage who's super smart and strong and beautiful. If she were real, I'd have sex with her immediately assuming she consented," Barbara responds.
"Even though you are exactly like her?" you ask.
"I... I'm not... I'm not like her,"Barbara says. Perhaps a more subtle approach is appropriate as her confidence is pretty low.
"Well, you are elvish," you say.
"I... I'm elvish," she says. Her ears become pointed, but that is the only visible change. She also probably has some sort of magical ability, but you can't visibly see that.
"And you are quite beautiful," you say.
"I.. I'm not... I'm pretty?" she asks. Her hair becomes better organized and of higher quality as well as lighting to a blonde color. Every blemish on her face disappears. Her breasts perk up a bit, but there isn't a particularly notable change there.
"You are very pretty," you say.
"I am very pretty," she says with confidence. Her breasts grow a bit, but her newfound beauty completely changes her outfit as well. While she is now taller, her pants disappear and her shirt become effectively a one piece bikini. Not particularly good armor, but she clearly follows the flaunt it if you got it stratagem. A cloak also forms. You're not quite sure why, but it does look cool.
"You are also incredibly intelligent," you add.
"I am incredibly intelligent," she agrees. Her eyes light up as new knowledge floods into her head. She can't resist testing it so she creates a fireball in her left hand and forms a staff in her right.
You don't know what else to do, so for now you release her from her trance. Her and Alex keep playing as if nothing changed. While Barbara is incredibly attractive, she was still only friends with Alex because everyone else seemed to want to use her for her looks or power or mind. Alex, however, was fine with just hanging out with a friend, and they bonded over that.