Isla hates her cot. Do you think that maybe it may help putting her in her own big bed?
I had the same issues getting Isla to sleep if I put her in her cot. But I toss that our of teh room & put a single bed int here & while its still a working prgress to get her to go off to sleep with out fuss. The fuss is now her chatting away & playing.

Just a thought...