Your neighbors might remember a time when you were needier than you are now. I think it is o.k. to recognize that they are in their own ways trying to be helpful and then cut them out or make a huge moat around them and you. Tell them you are staying home (inside) with Trip.

My understanding of the nature of suffering is very confused -- what with my Catholic upbringing and my little studying of Buddhism. My head feels muddled on this but Yoga does teach us to be present the moment.
I think you have the right idea about how to work things out for you.
You are in a very healthy place when you are willing to distance yourself from your sister's drama.
M