Hello. Baby is 6.5 months old. We're on formula. We introduced solids …

Hello. Baby is 6.5 months old. We're on formula. We introduced solids at 4 months. The question is: She refuses to eat anything. I'm talking about formula, I don't even mention that... If I give her formula during the day, our limit is 100ml, and otherwise 20-30 and that's it. I supplement with porridge and purees. But she doesn't eat them either. She drinks formula only at night. Approximately 180ml I think. How bad is it for a baby at this age without formula? I'm not planning to stop, but I worry that she's lacking vitamins