Who’s Aunt Rina?

What I do know of Aunt Rina is that she is another one George’s aunts who helped raise him. But, I was wondering what the importance of her character in the play was considering her character does not have a speaking role in the play? In Act One it is mentioned several times that Aunt Rina’s character is ill. With that, I am pretty sure Aunt Rina has more of an importance to the rest of the play as it is mentioned she embroidered George’s slippers while ill, which has many memories bound up within them. Besides these few incidents which mention Aunt Rina, I am not sure who her character is or her importance in the play. And it does not look as though she is talked about again in Act Two. I think Aunt Rina’s illness foreshadows what will occur later on in the play. (perhaps her death??????)