I do not know the requirements for foreign employment and clearances. That is not our line of work, and you should ask the companies involved about their health clearances.
The tests will check whether the hepatitis she contracted is still active or not, whether she has liver disease, and how serious her hepatitis B is. The tests that were requested were par for course, and are not excessive at all. You can have hepatitis even without symtpoms. There are antiviral treatments available depending on what condition she is in which will help if it is a severe type, but by and large, hepatitis B is treated thru supportive and symptomatic care, and that is the only management needed.