Hi There,
My dd was the same and gave up bottles completely at about 6.5 months. I too would say try adding more solids, I did a small breakfast of cereal with milk, lunch about 12.30 of veg, tiny snack at 3-3.30pm and tea which at that age was cereal with milk or rusks with milk at 6pm, this way I made sure she got her milk intake and food intake at night before bed, bed time was 7.30pm,
Fiona