Old Anime Series/OVA
That sounds like Wild Cardz, known in Japan as "Jaja Uma Quartet". It was an old Central Park Media release. The dub stars Apollo Smile as Coco Hearts.



As you remember, it began with a scene of the main character, Jo Diamonds, the brown-haired girl in the center, sleeping on a hill. Most of the OVA involved her chasing two giant chess pieces that were somehow the key to ultimate power. Opposing her was some random sexy woman, and this fellow:



Here's a picture of them together. I couldn't find it without the caption. Just ignore it. Wild Cardz is really awesome.



The other characters on the DVD cover are her allies, Coco Hearts (the blonde with cat ears), Casa Clubs (the girl with purple hair and dark skin), and Sunday Spades (the girl with short teal-hair). None of them really did much.

The scene where Jo is floating in a white void happens towards the end after some kind of big explosion. It happens for basically no reason, like pretty much everything in this show. At some time after that, Sunday Spades finally unleashes her true power, which is to make a big explosion and also blow off all her own clothes and make her hair grow really long. Here's a (NSFW) picture of that:


   


If you decide that you want to watch this, you can get the DVDs from Right Stuf for $8. Since it's so old, there's no legal streams or digital versions, and since it's so bad, I doubt anyone is going to license rescue it.