Can't say at this stage as developmentally she is just 20 days old . But in general if there is only prematurity at 34 weeks with no other risk factors at birth  like delayed cry  , hypoglycemia , oxygen requirements , seizures , severe jaundice etc there should be no reason why the baby should have developmental delay . So let's wait and watch . But it would be a good idea to talk and sing to your baby , have a colorful environment around her , gently massage her for skin stimulation . Basically stimulate all her five senses