Employment proof

my wife is working in a school, and she has changed her name in her employment. i have chekced that school register. i know the school name and address now my query is as under:-

how i will prove that she is working in that school.

school is saying that no body is working here in that name.

is there any trick or legal way by using i can prove that she is working in that school.

is rti work in that case.

Please revert point wise.

Thanks

AT