8 months old baby refuses to sleep in cot

Hi there, my 8 months old baby used to sleep on her own in the cot and will fall back to sleep with the pacifier in her mouth if she cries in the middle of the night but recently she rejects the pacifier continues to cry loudly and only stops after I carry her. She falls back to sleep almost immediately if i place her on my bed, but once I place her back to her cot she starts wailing and rejects her pacifier again. Any parents experience this before and what did you do?