My boy has just been through this, about 4 weeks of very fussy eating which is common around the one year mark according to Huckleberry app. He also has been ill and just had a week of antibiotics for suspected ear infection. I'm so pleased to say now he is back to his old self scoffing everything! I'm not one to run to the doctor usually, but I think if they're not eating or drinking well it's worth a checkup
We went through a similar phase that lasted 4-6 weeks 😭 he’s back to normal now but I started to do daily homemade smoothies and soups etc to up fruit and veg intake. With the soups I’d add lentils and chicken to get more protein in. Fingers crossed it doesn’t last too long!
Will she take the fruit smoothie type things from pouches? They have veg versions too? You could try those if you’re super worried. My daughter has never been a great eater. She loved starting blw but now isn’t really very interested in food. She’s EBF so I’m not worried about her nutrient intake but I can understand your worries.