Oh hun it sucks doesn't it. O was such a terrible sleeper so I can sympathise.

I agree 100% will Marcellus, give up watching the clock, it will just drive you insane. If she doesn't go to sleep within 20 or so give up, and try again later.

I really don't have any other advice, it sounds like you are trying everything. TBH O didn't even begin to sleep through until 12 months and now he takes himself to bed without any drama at all.

I know it is a long road but stick with it hun and before long I'm sure she will start sleeping longer patches.

HTH
Spring