11 month baby (lactose intolerance)

Hi Doctors, My baby is 11 months old. She diagnosed  lactose intolerant (she used to have cramps in her tummy after 3 months). We are giving her Nestle Lo Lac with lactase enzyme drops from 7 months. Even after that she used to have vomiting and pucking continuously, we tried to change the formula but it did not work because of her cramping. Now we are trying to give her solids but she is not accepting anything (she doesn't open her mouth for any food). As now she is 11 months, she does not do proper Crowling and also no teeth and is not able to stand. We are worried now as it's kind of a developmental delay and also we are helpless how to fulfill her nutrients need without solid and how to start solids because we feel lo-lac formula is not having sufficient nutrients. We will be very thankful  if anyone can help.