I wouldnt introduce a bottle at that age as bottles are supposed to be phased out by the age of 1. You could get a special new cup just for milk and let her drink from that. From the age of 1 around 350mls of milk is advised (in the UK, as it differs from country to country!). It doesnt have to all be in drink form as milk in cereal, cheese, yoghurt, etc counts towards it too. 3 portions of dairy should provide the recommended calcium.