Certainly!  The answers to the questions about the story may help expand it.

- The cup was a gift, so the grandmother likely was inspired by a gift giving occasion, such as a holiday or the protagonist's birthday.  It may have even been a cup the grandmother was given when she was a little girl.

- If the cup was given to the grandmother by another family member, it would indeed be a family heirloom.  It is possible the cup has been in the family a long time.  It is not clear in the story whether the protagonist is aware of this, however.

- The protagonist was very upset after the cup was broken.  She could not dispose of the broken cup, so she may have felt very nostalgic or guilty as well.  After she glued the cup back together, however, she felt better.  She may have felt relieved, or even accomplished.

- The protagonist may have considered having a professional repair the cup, however she did not do this.  It may have been to expensive to hire a professional, or she may not have been willing to trust such a special cup to another person.  It is also possible the protagonist felt she had to do it herself, either as a way of contributing to the cup's history and significance, or out of responsibility and atonement for allowing the cup to be broken in the first place.

- The cup symbolizes love, hope, and happiness for the protagonist because it is much more than just a cup.  The cup reminds the protagonist of her grandmother, a person she loves.  The cup also reminds the protagonist of all the good times she shared together with her grandmother, including time together spent with the cup. Those were happy times.  Lastly, the cup also reminded the protagonist of her childhood, and all the dreams she had for the future at that time. This is a form of hope.
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