Oh hun.. a girl from my MG was exactly the same.. she lives at home with her mum, bro & sis and her lil man shares a room with her and was in her bed basically from birth til 10mths.

In the end she went to sleep school as she wasn't getting the rest she needed and it was so hard for her to settle him, he now has his sleeps in his cot but he does wake during the night as he knows she's there.

She has a curtain up in the room b/w the cot and her bed so he can't SEE her, is a curtain or a screen an option for you?

Otherwise i agree, slowly make the change, let her fall asleep there but then transfer her into the cot.
Maybe try making a new bedtime routine, something fun for her... maybe bath, feed, reading time, cuddle then bed while she's nice and full and relaxed?

Prob no help at all.... good luck though.