Here's a good question. Why would she want to be out on bail? She would be grilled constantly by her parents, people hurling obscenities at her every time she leaves the house....can you imagine? I mean she wouldn't even be free to "go through other resources" to help find Caylee. IMO her being out of jail would blow her cover faster than in jail, if she were out, her parents would expect her to help investigate, which we all know isn't going to happen.....
Actually, one day Cindy was talking to the media and saying that they would probably get Casey a 'safe house' when she was bailed out so she would be safe from the media and, presumably, the 'kidnappers'. I have no doubt this was Casey's idea as a great way to get her parents to pay for a place of her own.