Mine seem to love their wet mash but I used to turn their chick crumble into mash as they were so tiny as chicks and the crumbles were so huge. My chickens don't like pellets or layers crumbles that much. I get them a crushed grain layers feed which they seem to enjoy, but I am in a different country to you so you could try something similar if you can find it. And they love their greens. Plus, being inside they do get treats, especially leftovers. Every time they see us with food they expect us to share!
You could try fermenting her feed to see if that makes it more palatable. You just put the food in a glass jar or food safe plastic container, cover well with luke warm water, cover with a lid or plastic wrap and leave it in a warm place but out of direct sunlight. You may need to add more water as the crumbles absorb it and keep the water level well above the top of the food, about an inch. After two or three days it will start to bubble (sometimes sooner if it's really warm) and smell sour, but not unpleasant. It should never smell of yeast or alcohol. I strain it through a fine sieve and feed it out wet. Keep some of the liquid and just add more food and luke warm water to it and it will be ready for the next day. You won't need much for one little bantam. It's something else to try anyway. I'd give her some in the morning (provided she will eat it) and give her treats later in the day.