Travel after Mastectomy
First of all why such long delay if breast ca is suspected?
Secondly, the aggressiveness of the tumour decides its outcome.
Chemotherapy certainly is VERY helpful despite its awful nature.
As another poster mentioned, make this a year of rest and recuperation.
Technically you can fly soon after the doctor feels the bleeding has stabilized but the body is in a low immune state and airplane flights or young children are not the best choices for an immune suppressed person.
Best wishes to your wife in this struugle against this disease, it is not a local disease as people think, it is a systemic, hormonally inflenced illness, so aggressive therapy brings good results.