Happy Cat Family

Hi Furriends!
Lucky here to report TROUBLE! I am the one posting today, since I am the only one who can seem to be able to say anything nice about this situation.
This little "lady" below (meowmy calls sweetie), is Gracie... She has moved into our bathroom last Monday, and has been there ever since.
See, her old meowmy can no longer take care of her due to Alzheimers and Gracie was doing very poorly outside... Gracie has lived in our building for the last 12 years (she is 12) as an inside/outside kitty, but she has been outside lately without her much needed thyroid medication.... Apparently our meowmy got softy and couldn't see Gracie doing badly any longer... So.... Long story short, here she is, in our bathroom since Monday.
Meowmy says that aside from the thyroid, she is doing fine... She is just very very thin... She lost 1.8lbs since April, last time she took her meds.
She also came in covered with fleas (ok, THAT is not cool), so Meowmy took her today to the groomers!
Let me tell you one thing furriends, I don't know how the groomers survived... This girl is MEAN! She hisses like no kitty - she sounds like a LIONESS! HHHHIIIIISSSSS! Even meowmy is afraid of her - you can believe it furriends, it is true!
She hisses hisses hisses.... Very scary.... I hope we all survive this thing called introduction...
Anyways, here is the lean mean eating Gracie machine! :)
<edit by Meowmy> Gracie is a sweetheart with me, lets me pet her, and everything... She is sure appreciating love, plenty of food, a warm bed, her meds, and the safety of a home... She doesn't seem depressed at all - I was very afraid of that, since she seemed to love outside so much. She is hissing less and less, but still hisses when I touch her in the wrong places, or try to put her in the carrier - or when I am with her and she sees the kitties. Like Lucky described, her hiss is scary, super scary actually :) something I have never seen before, specially considering she is tiny - but she doesn't show claws or anything like that. She gets her point across though, LOL. I am taking the introduction very slowly and will let her out of the bathroom only when she is comfortable with the kitties, as I don't want her to be stressed out and I want this to work - I want her to be happy here... I want her to have a pampered, sheltered and happy life forever and ever... She is a special little lady!