Thanks for contacting me a Just Answer. Let's see what we can do to help....
Of course no one can say for sure what has caused this change in her behavior. However, I would like to suggest a few things that may help your situation. First of all, realize that your feelings about how you are being treated by her may very likely be magnified due to your fathers health issues. This is common in these situations - and oh yes... this is not an uncommon scenario that you have presented (that may) bring you some sort of comfort I hope anyway).
Next, in these situations it's not uncommon for those that are "close" to us in the "manner" that your neighbor is are uncomfortable or unsure of their role. For instance if she was family, her role would be clear. If she was romantically involved, her role would be clear. She may feel that she doesn't want to cross the line or that she is intruding - this may not seem logical from your standpoint, but I have seen it happen.
So...... If my experience has prepared me to help you in this trying time (in other words if I'm right) I can tell you what has helped others..... It's not difficult :)
thank you i am very close to my father and feel very alone at the moment although I have lots of people around me
Simply approach her as explain it to her as you did to me - you can now even say to her that "...psychologists with experience in these situations say...." Let her know how you feel and express that you have been so busy and would really enjoy an opportunity for a glass of ice tea with a friend.