I think it was option A. Alex isn't safe standing still at Litchflied, the baddie can just send an assassin there (and I expect that to happen next season). Her best bet was to disappear. Alex is sneaky, she can survive fine in the street. She would've been fine.
I didn't see any need for revenge either.
What they show is Piper losing Larry and Polly. Then there's that talk she has with Soso about the loneliness of prison. Also, Alex tells her she has to disappear now and Piper begs her to not leave her. To top it off, towards the end Piper goes to her corner to read Alex's letters (BTW, why was that letter a photocopy?!!).
What I understood was that she felt abandoned completely, and desperately brought Alex back so she could have someone. I thought it was really shitty and worse than the shit Alex has pulled, frankly. She has 8 months left on her sentence, while Alex has years.
I was very disappointed by the amount of Piper this season, frankly. She's not a fantastic person, but I thought she was good as the central character. I don't like ensemble shows where it feels like there is no central character, they feel too messy for my taste, and that's how I felt this season (I kept thinking about Glee *shudders*). I also don't like it when they change things halfway through: if I liked the show how it was, with the focus on the characters they gave focus originally, I don't like it when they change it later because then it is going to be a hit and miss for me. In this season there was so much I couldn't care less about, while I was frustrated waiting for the stuff I signed up for to be touched upon again.
I really hated the Vee plot, specially. I thought it just took over and Vee was such a one note character. There was no depth to her and she just ruined all the characters she touched. By the end of the season I wanted pretty much all of the ones in her gang/storyline, with the exception of Possey (sp??) to fuck off. The actress was great, though.
I did like the Morello twist very much, though. And Rosa. And Gloria. And some background stories. Caputo in a band was fun. But overall there wasn't any plot I really became interested in, sadly.