I had exact same problem with my daughter at the same age. With the help of my mum (she kept me strong) We gradually started weaning her off me by doing what you are doing to start with , then gradually moving away from the cot eventually sitting outside the door and then moving downstairs. Yes she still stood up and cried but you could tell she was only wanting attention because every time I walked in to the room she immediately stopped crying! (It took about 3 to 4 weeks). Perservere it is well worth it as and I had no further difficulties at bedtime (shes a beautiful 16 year old now). Good luck !
