Is Aptamil Pepti The Best Option For My Infant With Suspected Cow Milk Protein Allergy?

hi my 5 month daughter is suspected of Cow milk protein allergy. Doctor has suggested us to shift to aptamil pepti and asked my wife to remove dairy from her diet. Someone is suggesting us to shift to isomil/ zerolac for the same. Please suggest the right option. And when can my wife reintroduce dairy in her diet. It has been 2 months now.