Hi hun, . It sounds very frustrating to have found that what was working now isn't.

It sounds like she's still hungry. If she won't settle, try bfing her. She could be going through a growth spurt, or maybe she just fell asleep before she was done during the first bf.

Have you tried waking her by changing her, swapping sides, etc, once she falls asleep initially, just to see if she does want more? It sounds like putting her in her cot is waking her and she realises she's still hungry.

She's still only little, so if it isn't a hunger issue, perhaps trying to put her in a sling or wrap might work for you?