Normally when talking to Ashanti, you should be able to
If not, you might to be far enough yet. Did you talk to Susan enough about Alli to learn about the dog?
Well. I loaded an earlier save (before Joey shows up) and I get that option when I ask about the dog. But on my later save there's no options at all apart from "Ask to leave".
I've exhausted all the dialogue options with everyone about everything and now it's just repeating.
I think I've actually discovered a game breaking point! I hardly spoke to Nishanti at all and now I can't talk to her about anything since it went past a certain point.
Guess I'll just have to start from the old save...
EDIT- Yep. It's a bug. Dave Gilbert knows about it. I've just checked the Wadjet forums and there's alot of people with the same issue.