From her post, I gather that since this was an Obsidian game, she assumed she would be able to make a female character. Moreover, the comparison with DX suggests she thought it would be an excellent game.
The comparison with Deus Ex, a game that had only a male protagonist, is a blatant juxtaposition to her point and undermines it.
Deus Ex is an example of her enjoying a game without having to play as a female character.
If she's upset for assuming something that Obsidian never said, while at the same time in light of Obsidian stating (repeatedly) that the game was going to be about the protagonist "Michael Thorton," I think she was setting herself up for disappointment.