Battery disconnect switch won't turn on

A friend is having this same problem. We think the battery is probably dead (I'm not there with my charger and she just bought the RT and doesn't have one yet) but her battery light (blue) is on all the time, even when the engine is off and the vehicle is not plugged into shore power. She said there is a little light on top of the vehicle near the antenna that used to be on all the time (couldn't find any switch in the vehicle suggesting it had anything to do with the antenna) but now that's gone out. She's driving 2 hours tomorrow and will try the switch again. Anyone know why that battery light might be on all the time? Especially since we think the battery might be dead? Her disconnect switch won't turn on and plugging it in for 2 days hasn't helped. You can find a photo of her panel here: http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/29006630/gotomsg/29006792/p/1.cfm#29006792