Like some others have mentioned, there's no real benefit to steaming your vagina. Just because a celebrity does it doesn't mean it's any good. Your vagina is designed to manage it's own pH and it's own cleaning (hence discharges). Even things like douching aren't recommended. Just leave your vaginal canal to do it's own thing, and all will be well :)
So I may have come here a bit late, surely if you are say standing and steaming, only the very outside is likely to get any "steaming" ? Somewhat like when you wash in the shower as it's not (usually) 'open' to the point any steam is going inside? Sounds like total rubbish to me, nature has managed to keep things perfectly fine for thousands of years ?