Board Thread:Speculation House/@comment-3257939-20150601205621/@comment-209421-20151109091652

Well, fair enough. As you said, it's been weeks. However, those weeks were leading up to a tournament and festival.

Unlike Yang, who seems to disregard pressure (setting up for the dance was not stressful to her) I don't see Weiss as being the kind of girl to slack off in her studies and practice/training to go on a date with somebody who could be the competition. Especially since Blake and Sun clearly have been spending time together (the blush, Blake's knowledge of things in Team SSSN). Weiss may have used that time in training herself/trying to train her teammates to improve for the festival.

Adding onto this is the friendship between teams JNPR and RWBY. Weiss grew up in a high-risk world of big corporations (The constant attacks of the White Fang against the SDC), so I'm fairly sure that she'd have some knowledge of risk management and information defense. Considering that Ruby kinda says whatever enters her head at the given moment (providing Emerald with the identity of the two second-round fighters), Weiss may feel that it's her responsibility to try to cut down on the potential information leaks down to whoever Ruby's talking to and their close friends in JNPR. Due to this, she doesn't go out with Neptune out of fear.

Another option is that she turns him down in trade for him turning her down for the dance.

Note how I'm trying to reinforce as many points as I can, but can't cover anything.