It's just a bit of a stretch to think that a VC not giving her money must be because he was thinking "oh, she is definitely more competent and knows more about this space than this other founder, but because she's a woman I'm going to cut her out and go with the other guy."
In other words, unconscious bias.
Even if it were a case of unconscious bias, though, that doesn't mean she should be on Twitter accusing of him of committing collective violence against women of color by choosing to fund a white guy instead of her.