Ex-Danity Kane Singer -- I Got Screwed Out Of The Reunion

Original Danity Kane singer D. Woods would have LOVED to perform with the group during their reunion concert in L.A. this week ... only problem, she says they didn't invite her.

Woods tells us she first heard about the groups reunion plans back in May -- but not through the girls -- instead she learned via TMZ ... when we shot the girls meeting up with a new manager.

The 29-year old singer says none of the girls ever expressed any interest in a reunion after breaking up 5 years ago ... and Woods was met with resistance every time she tried.

Woods isn't quite sure why the girls want nothing to do with her ... but says she's happy they're still having success with "the sound that I helped them create."

Sure sounds like it.