They can still get Audrey out if Da'vonne wins PoV. Audrey is a loose cannon that everyone hates and someone is going to get her out eventually. Da'vonne stated she doesn't trust Shelli...you don't know who Audrey would target if she won...you know Da'vonne would target you. It's actually a good move if the rest of the house doesn't turn on you for not getting Audrey out. The only way it backfires is if the dentist wins PoV and you don't put Audrey up...otherwise you either replace Da'vonne with Audrey, if she wins or someone uses PoV on her, or say "I tried, but guess we'll go with Plan B (which is really Plan A) and take out Da'vonne.
I feel dirty talking about the strategy in this game. So many parts of the game annoy me, but I can't stop watching.