The -101C>T mutation is indeed a silent mutation and the child should have the outcome of a thal minor, but more likely a minor with hemoglobin on the lower end of normal for a thal minor. The outcome will be determined by the IVS-I-1 G->A mutation, as that is a beta zero mutation.
Good nutrition is an important part of the program of thal minors, especially when the minor is a result of a beta zero mutation.