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No need to worry yet. It can take them some time to get into the swing of things. You might want to make sure she isn't laying somewhere else though--new layers sometimes drop eggs in weird places. Also, sometimes if she lays somewhere like on a shelf or somewhere higher the egg can roll off...

The Original Poster is in Australia, it is not winter there anymore so the poster is correct to turn off the light--it's not going to help much anymore.

I wouldn't bother adding heat, too much heat can suppress laying also. If it's spring where you are you can just let the sun do the job. They certainly look like they are old enough. Nice red combs look like they should be coming into lay. They're the right color for pullet ISA browns, so...

Are you sure they're 6 months and not older or younger? You could try posting pictures of the birds here or in the "What Breed or Gender" tab for some guidance. 6 months is when most people expect pullets to start laying, so they might just be late bloomers. I know ISAs should be good...