CAT EXPERTS ...I need a lil help...

If you are really good with cats & can make any reasonable suggestions please read on...

We recently moved into a new house...the neighbors are great & we get along wonderfully.
They have been wonderfully forgiving of all the animals I have & they even enjoy visiting with them from time to time. All's well so far....

They have a beautiful huge cat, that I just love! She is sweet & friendly for the most part, BUT she is having a little trouble understanding "we" are not her family...lol

It's kinda sad story for her, her family DID live in our house & they moved off & left her!!
The neighbors kindly adopted her, took her in, had her spayed, shots, took her to the groomer & she had the works.

The BIG problem is she doesn't understand MY cat belongs here...lol
The neighbors cat peeks in the windows on a daily basis & of course MY cat is sleeping in the window....so of course you know they start fighting through the glass.:(

My cat is basically an indoor cat , she does like to go out and sun her self ,but not often.

So.... ANY suggestions as to how we can explain to the neighbors cat SHE DOESN'T LIVE here & it's OK that my cat does????


Thanks,
MsC