plans on a way to be true/meet romeo and forgiveromeo after he is banished for keilling her cousin
The first character to mention the idea of marriage in "Romeo and Juliet" is Lady Capulet, who discusses the prospect of Juliet marrying Paris with her daughter.
The Nurse foils the character of Juliet's mother, Lady Capulet. As her mother, Lady Capulet should know everything that there is about her daughter; she should know how old she is and her innermost feelings. However, Lady Capulet knows neither. Early on in Act 1, Lady Capulet is unsure of Juliet's age and the Nurse has an extended speech in which she explains to Juliet's mother how she knows how old Juliet is better than her mother does. Additionally, throughout the play, it is the Nurse that Juliet goes to for advice and assistance, not her mother.
Your question is unclear. Is Duty a different play from Romeo and Juliet which also has a character called Lady Capulet? (actually, the character in Romeo and Juliet was not called Lady Capulet in Shakespeare's time--since Capulet was no lord, she could not be a lady. She is called the much simpler "Mother".)
There are either four or five "named" female characters, depending on your perspective. The definite ones are Juliet, of course, Lady Capulet, Lady Montague, and the Nurse. The one that's "iffy" is Rosaline, who plays a significant role in early dialogue but never actually appears in any of the scenes.
Lady Capulet imagines that Juliet is crying because Tybalt, Lady Capulet's kinsman and consequently also Juliet's, is dead.
Lady Capulet supports Juliet's marriage o Paris.
Lady Juliet Tadgell was born on 1935-01-24.
Lady Capulet tells Juliet that she has arranged for her to marry Paris.
queen,lady,nice,tall,
Lady Capulet wanted Juliet to seriously consider marriage, and that Juliet was already older than Lady Capulet was when she got married.
Lady Capulet teases Lord Capulet about his age by saying that he must dance at least once at Juliet's wedding in order to prove that he still has his youthful energy. She also suggests that his dancing skills may not be as sharp as they once were, playfully teasing him about his age.
Lady Montague dies of grief over Romeo her only son being banished from Verona.