Simple :3 Aside from the changes in Krakoa across the past year. She's got superpowers, and Felicia adores her. Because Felicia adores her it gives the worst luck to anyone that messes with them. Which means an instant 777 transformation :P And they wouldn't want to mess with Mary Jane in her 777 Form
In essence, Felicia is MJ's good luck charm ... and date for the Gala.