Buy branded pet food like pedigree pro , drools ultimate with high protein above 24% and fat above 14% , even now she is 1 yr old give her puppy food than adult cause puppy food has more nutrients and all needy things will recover health faster , get her curd mixed in food once a day , multivitamin tablets , to gain weight give her 28 grams per kg per day dog food , after normal give 23 grams per kg per day , good luck 👍

And yes don't forget boiled eggs , 2-3 eggs per day and boiled chicken mixed in food 3 times/week

You can give pedigree pro complete nutrition with external supplements

How about royal canin? Is it helping in weight gain ?