I also thought it was Andrea in the truck too. Definitely looked like a female and I thought I saw blonde hair when she first got out, but when it showed her running off I couldn't see any hair at all. The more I thought about it I figured it couldn't be her because she didn't know where the governer had gone, but then my wife made a pretty good observation and said "you couldn't tell which direction she ran when she got out of the van, maybe it was Andrea and she ran to the prison". She said she figured that'd be a good idea for Andrea so the governer wouldn't see her leaving the town.
I hate to say it, but if Rick doesn't get his shit together soon, I want him to die. I was beyond thrilled when Lori died and now we have to see her again every episode because he's lost it. I don't want anymore of that pussy drama bullshit that took over the first half of season 2.
Also, I think Talking Dead is way better as an hour long show.