Hi, I Want To Consult With Child Specialist Doctor My

Hi,
I want to consult with child specialist doctor
My question is, My niece is having hernia in her right side, she is just 45 days old and important things is she born 1 month earlier she born in 8th month.
we are living in Pakistan and we have consulted with child specialist here they said she is having hernia and this should be operated child specialist sended as to a surgeon and he said this have to be operated he said I have pushed her hernia with my finger now she will not feel pain for 1 week and if this comes out after I week then you to come for the surgery.
we are so tensed about this all she is very small and her weight is only 3.5 kg and surgeon gave us date 12th of this month for the surgery we are worried because she is just 45 days old and weight only 3.5 kg

can you suggest us should we take her for the surgery or not ??
or should we wait ??
if we have to wait then till what time we have to wait for ??