inspired by this scene from the last episode:3

9. Rosie didn't come clean about actually being Lilith because then Heaven would possibly find out and capture her. On the same note, if "Rosie" knows about Charlie trying to call her, maybe she doesn't answer for the same reason. But now that there's peace between Heaven and Hell, she finally calls

7. What if Alastor resents Lucifer cuz Alastor tried to summon him back when he was human, but Lucifer didn't answer, so Alastor called for Lilith, who did end up answering.

8. The deal between Alastor and Rosie clearly has to do something with Charlie

6. In s1, Rosie encourages Charlie to sing to the cannibals. Singing as a way to lead is a thing Lilith does, plus Rosie seemed to believe (or even know) that Charlie would be able to convince the cannibals with her signing

5. We know that Lilith empowers sinners, so what if 7 years ago she almost succeeded with her plans against Heaven, but Heaven stopped her and tried trapping her in Heaven, but Lilith split herself in 2, her body(in Heaven) and soul(in Hell, as Rosie)

3. Rosie seemingly wants Charlie to be protected, but prior to their first meeting in s1, Charlie didn't know Rosie- unless Rosie is lying about who she is

4. The "Lilith" we see in Heaven is only Lilith's body, thats why she can't speak, cuz she doesn't have her soul nor powers