she needs water and electrolyte supplementation
I am sorry about your wife's current health status. It seems like she is losing more of water and electrolytes due to vomiting
At this stage, it is very important to maintain the water and electrolyte balance in her body. I suggest you to give her more of electrolyte water, fresh fruit juices orally now.
Her temperature is low. It would be better if you can take her to the hospital, so that she can take a shot of Ondansetron
injection to stop the vomiting immediately.
A stool routine is advised to check for any gut infection, and start antibiotics if required. She could also get a couple of IV fluids, if required.
Hope this helps your wife to get better soon.