Hi, You need to change Rumi's food timings. The dinner should be given last by 8:30 PM and avoid giving heavy food like chicken, eggs, meat. Just give her curd rice for a month or two. Also if you're giving excess amount of food, it may also cause vomiting because our dogs cannot identify how much to consume. It's better to give a small amount specially during nights. If Rumi feels hungry, then give her some fruits like apple, half banana, papaya, dog biscuits maximum by 11 PM.

It may also be caused by worms so u start deworming