Would a child grown in total isolation develop a language?

When you mean isolation do you mean no siblings ? Surely there are some adults around the child throughout the day. Children definitely need to have people around them to pick up better language skills and communication skill and not forgetting social skill. If your child has no siblings the main caretaker and you and your husband should try to talk to her more. But if you mean isolation like totally no one around her then you should solve the isolation issue first