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According to an old Sandra Rose article, Solange has BEEN diagnosed bipolar. For a while hollywood has buzzed about Solange having mental issues. This incident repeatedly swinging at brother-in-law Jay-Z definitely shed light to her condition.
According to Health.com she has also said to have been diagnosed with A.D.D. (attention deficit disorder) twice and has admitted to telling silly lies to make stories more interesting. She has concealed her depression and health issues with medication and the support of her family.
Solange's career has suffered due to her mental condition. At one point she had to cancel her European tour to get well.
Beyonce herself mentioned in a documentary that Solange dismantaled her trophies one time because she was mad it wasn't her who won them.