I don't think your going to get too much information from this picture. The young lady is obviously a novice (student)nun who has not taken her final vows, due to the fact that her hair is exposed. The crucifix's are probably generic in nature and are typical for the period. The picture has been taken in a studio by a professional photographer - the painted sceen in the back gives that away. I believe this picture would probably been taken shortly before a nun took her final vows and was for her family as a farewell gift. I believe full nuns were strongly discouraged from having their pictures taken and rarely communicated with their families.
Some young women who lived in convents and who were not studying to be nuns would have dressed in a similar manner.