When it comes to the SoB going from rank one to two and so on, how do you know when they reach each rank? I didn't see anything that says at this many points she moves to the next rank. Just what did I miss?

The XP/rank table in Dark Heresy core.

Or the adjusted rank progression table in Ascension (one of the few things in that book that would genuinely improve a game, imho)

The XP/rank table in Dark Heresy core.

Or the adjusted rank progression table in Ascension (one of the few things in that book that would genuinely improve a game, imho)

What pages?

Core's in the chargen chapter.

Ascension's page is around 21-23

Ok I found the info, thanks everyone.

Second question. After a sister reaches lvl 8 how does one continue to play her in ascension?

FFG has published a post-release digital supplement that adds the Palatine as an option for Ascended Adepta Sororitas, and mentions which other Ascended careers the class may be eligible for. It was made with the BoM Sororitas in mind, but should also work with the original Sororitas from Black Industries' Inquisitor's Handbook.

You can find it < here >

Outstanding! Thanks.

You're welcome -- have fun and Ave Imperator!

Oh, good to have, because I'm actually running a sororitas game atm!