I've had Pippa at max affection for a while now, and I also told her that I have Yammi on crew. According to the wiki, it is stated that if she's at 75% affection, she'll send an email saying she wishes to join. It has been nearly an in-game year with her affection remaining the same.
Bit lost as to what to do here, help?
Bit lost as to what to do here, help?