Right now the austwins have no reason to go after Becky except on Vanessa's or Shelli's say so. They don't like her, but they don't see her as a threat either. Why get rid of one of the three and make 2 of them notice you? That increases her enemy count by 2.

If she puts up Jmac (if somehow vanessa wins veto) she can say she's just following the plan the house (Vanessa) made last week. Voila, she switches sides back to the one in power while pulling an andy and helping the underdogs thus making her valuable. I'm not saying its ideal, but she really has this thing where she likes to run from one side to the other with info. It has "worked" for her so far (of course we see she's not doing a great job at it, but does she know she sucks at it?)...by working I mean it has given her some power for a couple of weeks and she hasn't been a target.

She's not really close with anyone but Jmac. James doesn't care about her one way or the other, but he, jackie, and meg all know she's not really 'one of them.' If she puts up Jmac she doesn't create any more enemies because he'll go. Vanessa has an agreement with Steve too, so she'll want Jmac gone, and shelly will be forced to choose to evict jmac or she'll out herself as closer to Jmac...and no one else. Better bet for her to stay with shelly if she wants to last longer. They'll have the numbers and 2 of the other 3 really don't trust her.

On a side note, Megs been an anomoly for me. I get the feeling she has a deal with Vanessa. She's derailed a few conversations in the past when Vanessa gets brought up. I haven't seen enough of the feeds to be absolutely certain, but I'd be willing to bet Meg's got at least 1 or 2 connections outside of the ADC.