I'm too knew to poly to really comment on many things here (for example, until I went back and looked at the definitions thread, I was not so sure of the difference between a triad and a v). But what I CAN comment on is divorce. In my opinion, the fact that she's going through a separation is a bit of a negative. Divorce is very draining even when it goes well... and I'm a strong believer in not jumping from a bad marriage straight into another serious relationship. Some "recalibration" of one's sense of self needs to happen after a divorce. I'm not convinced that it's a good idea to try to process a divorce and build a brand new relationship at the same time.
But you can't really pick your timing... you get what you get. Good luck to you.
Leelee, all alone.