About my baby diet. Switch to cow milk?

Hello all my baby is 11 monthes old.She was formula feeding girl,because i have no breast milk.Now a days she was refusing to take solid and semi solid foods.Iam interested to feed all kinds of fruits and veggies.Daily i fed fruits like grapes,kiwis,banana,avacado and also boiled egg yolk.But iam worried about her health .Due to formula milk i thought that she might have less calcium.I started using calcium syrup for her.Recently i observed that she is licking wall.I stopped her doing this kind of things.But in my absence she may be doing.I want my baby healthy.can anyone suggest why babies lick walls? any medicine to stop this? Any vaccine required for her health.From the last month i started feeding buffalo milk . shall i continue or switch to cow milk? Iam a vegeterian.Please suggest me.iam so much worried about her health...