Hello and welcome to YT. I'm sorry that little Molly is sick, I hope the vet visit goes well today and he/she does the necessary blood tests to check her liver and overall health.
I agree with Harrysmum that chicken and veg alone doesn't sound like a balanced diet. If you choose to homecook it's important to supplement with essential vitamins and minerals. Adult doggies are normally fed at least twice a day, some do better with 3 meals but 2 is the average. Could you divide Molly's food and feed her morning and evening?
I also have a 2 year old little yorkie girl and she gets 2 main meals a day (breakfast and dinner) plus she also gets a small snack at lunchtime or healthy treats throughout the day.
If you need help choosing a suitable food please ask
. Many members here homecook and can also help you choose kibble she might enjoy. My little one loves Lily's Kitchen kibble. I also feed raw (which has to be balanced too).
The best of luck and please keep us updated.