At this stage the main source nutrition should still be milk though, so I think it's better to make sure she drinks enough milk rather than focusing on the solid. Solids should be more for exploration at this point. How much milk is she getting each day? Can you try to feed the solids away from milk time so her milk intake isn't affected by the solid?
My LO went through similar episodes during the teething phase and when she was falling sick. What food are you giving her so far?
Might be on milk strike. I had same issue on can nurse. Wait for the phase to be over or introduce food let them hold themselves.
Mine took about 2 month. I had friends whose baby got normal after 2 weeks plus
Cherlyn