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It's not ringing any bells for me, but you could try checking the Evil Matriarch page, or checking the seasonal lists on My Anime List for years around the time you saw the show. https://myanimelist.net/anime/season/archive
I checked for all the 2008 and 2009 seasons and didn't see anything with characters on the cover that matched what you described, but you could always give those years another look in case your memory's a little blurry! Beyond that, I guess I'd start at Fall 2007 and work backwards. Hopefully someone will be able to help you before it comes to that!

I don't remember much about this anime, i saw it like 8 or 9 years ago. The protagonist was a young girl with pink hair and baggy green clothes and (maybe) a bandana of the same color. The plot was something like her journey to find her parents. It was set on a prairie/grassland-like world. There was a blonde female villain who I think was in some way related to the protagonist (perhaps her mother?). Any ideas? Thanks in advance.