I can actually see a reason they might not have. When he first got back, Tali was away/out of contact/otherwise tied up, and by the time she was able to look him up he was already back with Kei, and she didn't want to intrude.

(Insert "circumstances conspiring to keep her from having a chance after she'd waited a respectable period" here.)

Then, when Kei disappears, well... no matter how much she might want to show up and support him, there's really no good way to do that; in a situation like that, it'd be almost impossible to not feel like you're coming across like 'Hi, your wife's dead or missing, but I'm here so we can pick back up where we left off!', whether you *are* or not.

Shalon Wood