Develop a design concept for a birthday party invitation inspired by the 'glittery glam barbie birthday bash.' the theme should continue to revolve around a black barbie doll, glittery elements, and shades of pink, gold, and silver. this time, focus on incorporating the idea of a 'garden of glam' where black girl barbie is surrounded by glittery flowers, butterflies, and other enchanting garden-themed decor. the invitation should exude an air of elegance, charm, and whimsy. please ensure the design remains cute, unique, fun, and functional, with an emphasis on creating a visually stunning and unforgettable invitation.