My kitty died today don't know why

One day I was near my office I went to pray in mosque and after returning I found one small and very weak kitty siting in middle of road and not moving at all. It was night and dark and I was going to step on her but god willing I saw her and iam not a pet lover never had any pet in my life but seeing her condition I though of taking her home . In my country people don't have enough money to they don't bother of animal because they are worried for their our surviving. I picked her and bring to my home. Next  day I took her to vet he told me her condition not good and he started treatment of stomach infection. My question for this point was it correct because no blood test was done
? He gave some syrup for stomach infection and in 1 week she looked fine . I brought a cage for her because my family is not use to pet and had concerns initially. To get out of cage she hurt herself some time and had some dirty spots on her face. Everyone in my house felt bad so we avoided putting in her cage. But her condition deteriorate after one week again I went to vet he gave her water drip . He said Her water level is down. She never drink  of her own so with dropped or injection we used to feed water In her mouth. Also dr told she is malnutrition and gave tuna fish jefishand multi vitamin syrup. we were feeding her with meralac earlier then we gave tuna jelly for one day then someone suggest me give her  very small fish so I brought that and she loved to eat then in all 3 meals she was wanting these fish and we gave her because this for something she was eating willingly. Now since last 3 days she had problem of potty she would try hard which I observed . So today is sunday and on Friday she  gave up and exhousted my mother and wife who now loved her life anything run to another vet in hurry that vet gave her anima to loose poty 2 times also gave a syrup to loose poty but she looked very weak on Saturday I saw she is doing poty some how but was able to put out. Till evening she was able to do poty but was hard and I saw little blood on poty. she looked very weak her back legs she would not able to balance .we gave her multivitamin , Water, meralac and some time jelly fish and stopped small raw fish in this duration. But she was not improving yesterday night she did  poty but double in quantity and just laid on one place . My wife now she loved her like her daughter put her in her arms and stated crying and praying . I tried to get in touch with vets but no one was available in mid night ...she just look to our faces without any blink. But we gave her water . I also gave her antibiotic syrip which vet gave her earlier in hope she could fight . Her last moments were painful...she just went out of my wife arm by falling here and there because of weak or problem she was having. And laid flat looking at us without blink.though iam strong but  It made me cry to because I was helpless to do anything . It was clear to me now she will not survive. I gave her some abe zam zam ..holy water which my relative brought from mecca which we usually give to any one who is dying . Her breath was fast some time it get very slow but mostly fast . And she suddenly moved treabbly in her lying position she started swinging  her tail I think which was in paint Shae moved treabbly this happened 5 to 6 times in 30 min I think something internal was happening . And then she shouted in very low voice with full mouth open 3 times and her soul went away. I burried her today mor ing itself.

Now my question what happened to her which disease caused her death
What went wrong where did we lack and why vet didn't identified her problem.
Answers to these question will help me decide should I bring another strek cat from road or not because she only lived 18 days with me her age was 1.5 month.my wife loved her like her daughter
And crying since morning. So need to decide. Please reply with ur genue comments

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