Sorry Pink Lilly I lost your PM and haven't had a chance to respond.

With the 40min sleeps is she happy in between? How long is she sleeping for at night? Are you getting at least one decent block? I know some babies which sleep all night and only have short sleeps during the day and have now extended them themselves. If she is happy I would go with it, so not worth the angst. If she isn't which I imagine that's why you are writing here keep persisting, it may take a while.

Basically just keep trying the resettling at 30mins, even pick her up. As someone said you can only try it if it doesnt work you know then. I try to resettle but it doesn't always work, if he is wide awake I don't even try. I have found if I get to him before he makes a cry he goes back to sleep. That is where my baby monitor is good - if it clicks on a few times and no sound I go and check on him as he is usually stirring. I have been able to extend him this way a few times. Few quick pats and dummy back in.