My husband’s six-year-old daughter from previous marriage has not accepted me even after one year of marriage. Any tips to make her open up to me?

Communication is the key. Talk to her and find out why? Or could it be that she felt threaten and the fear of losing her dad? I think the need to reassure her that you are now part of the family so that she would more secure. Especially if the daughter is at the age of 6 where she requires a lot tender loving care. Alternatively, Speak to your husband and let him to be the one to approach this issue, it makes your step-daughter easier to open up.