Where is Grumpy Cat?

 Grumpy Cat demands affection... NOW.

Lately she is Absent Cat.  On friday afternoon I got to come home early (it's our one perk at work, when we have 3-day weekends), so I managed to catch my neighbor in front of her house.  I took the opportunity to ask her about Grumpy Cat... does she know if it has a name, if anybody owns it?  I said that the cat had suddenly taken a liking to me, so I was hoping to give it little treats if it wasn't getting love anywhere else.  The neighbor said that nobody on our street knows who the cat belongs to, that she sees it around often too (crossing along the top of the back fence).  Then she wouldn't meet my eyes, and said that the cat was "pretty wild" and kind of stuttered and looked sad and said she was glad that I had been able to form a bond with the cat... oh, and that it was good for the cat too.  On one hand I was happy that it didn't belong to anyone (egads, am I subconsciously adopting her?), but on the other hand it definitely felt like the neighbor was hiding something.

Facts I know about Grumpy Cat:
1.  He is really a she.  It looks like she's a "fixed" she.
2.  She is comfortable indoors and prefers to be there.  Until she decided she liked me, she was always peeking in the bedroom door, rather than the living room door, as though looking for someone.
3.  She loves tuna.
4.  She is ridiculously afraid of hoses and spraying water.
5.  It took her over 6 months to trust me... and most animals trust me immediately. 
6.  She acts like our backyard is, and always has been, HER domain.  She is protective of the house's inhabitants.
7.  There is a little spot on her side that, when rubbed, makes her flip over in hilarious ecstasy.

My theories on the feline's origins are:
1.  Grumpy Cat belongs to the neighbor, and she was embarrassed or weirded out that I was befriending her outdoor, unfriendly, collarless cat (hence the "hiding something"?). 
2.  A sheltered Grumpy Cat belonged to the elderly couple who owned the house before us (they owned it since it was built in 1984).  She was "released" outdoors when they left (or died... I still haven't explained the translucent image of a white-haired, muumuu-wearing woman seen a few times in the backyard and bedroom!).  The lady who rented the house for 3 months between us and the original owners chased the cat out and sprayed it with the hose, thus causing it to be traumatized.  Neighbor was very close friends with the owners (which is true, she has told me this).
3.  Grumpy Cat really lives in the adjacent cul-de-sac... our street doesn't really socialize with their street, so no one here would know the cat's origins.

Either way, Grumpy Cat is now missing.  Did the neighbor bring the feline indoors, to protect it from me turning in the "unowned" neighborhood cat?  I haven't seen her since, and her pattern for the past few weeks had been to wait for me outside in the afternoons, and hang out under the zen bench at least every weekend morning.  I had broken down and finally got her some real cat treats (rather than give her just tuna... which I hear isn't that good for cats)... now I have no mammal to give them to.  I wish I'd asked the neighbor more questions!