Just an upfront note - What I'm about to say is not meant to lessen the great news you've shared. As optionken
said, more people need to read - and seriously consider - your success. If they would, I'd bet that 75% of the posts on health problems here would disappear.
What I want to post is a caution about rapid weight loss in cats. Among all mamals, cats seem to be unique - when a cat's liver is forced to turn to body fat for "food", it "bites off more than it can chew"...it takes in more fat than it can process and absorbs the fat...this is the life-threatening condition called Hepatic Lipidosis. In this forum, we've just witnessed the loss of bran01's Punky
So, for anyone intent on - or in the process of -reducing a cat's weight, Dr. Lisa Pierson, a Veterinarian and Feline nutrition expert gives some guidelines for safe weight loss on her website - she even suggests the use (purchase) of a baby scale to closely monitor the cat's weight, and the emphasis is on s - l - o - w and careful
There are two sections on this...here
Now, I have not done the math on your cat's weight loss - I'll leave that to you. It just appears to very fast...now, what's done is done, but, if it were I, I would be monitoring her weight carefully over the next while.
I have to tell you that I'm concerned about the (only) two meals a day - I have a feeling that may have been the major contributor to her weight loss. If it were I, (in your shoes, that is) I would "up" the number of meals.
There's a secondary reason for providing several small meals in a 24 hour period. Research indicates that small cats (as opposed to large cats, i.e. lions/tigers) not only do, but must eat several small meals over a 24 hour period. I say "must" because of how their systems are designed. Science has found that, when cats eat, their urine, which tends to be acidic, becomes more alkaline...this has been called the "post-prandial alkaline tide", and this natural occurrence helps to balance out the urine ph. If a cat is eating less frequently, the urine will acidify excessively...therein lies a lesson for those of us who only feed twice daily. We may very well be risking the development of struvite crystals. Free-feeding (of feline-appropriate foods) or frequent small meal feeding is more in line with a small cat's natural disposition and ensures our cats' "urinary health".