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Hey maybe check this out: https://myanimelist.net/featured/1224/Top_20_Anime_Girls_with_Purple_Hair_on_MAL
is it one of them?
Don't think I can help, but you could try looking up the character on http://animecharactersdatabase.com/
There's also the list of anime that are/were streamed on Hulu: http://redditanime.wikia.com/wiki/Hulu_Streaming_Anime
; maybe something rings a bell.

So, I remember watching the first bit of an anime episode on Hulu before the great anime purge. I didn't see much, and my memory may not even be accurate, but I remember the main character being an emotionless-looking girl with long purple hair. She was in middle school, I believe, and had only one friend from another school. I remember a scene where she goes to visit this friend, who I believe had light, short hair, at the friend's home. When she walks in, she sees another girl on top of her friend, and they claim to have been having a tickling fight, or something similar. The main character gets angry, and that's all I can remember.
Sorry I can't remember more, this has been bothering me for so long because I really want to watch more of this anime!