How To Get Proof That Wife Is Earning

my wife has left me long back and despite my attempts she was not coming. I have to file case under section 9 (which is a complete waste). She never appeared in that case for last 3 years. In return she filed case under section 125 ( maintenance case - criminal nature). Court has given order for temporary alimony. She more educated then me and currently working in a cloth shop. Shop owner refusing to give any proof of her employment. I am also hardly earning anything and switched between different jobs in past and currently unemployed. I want to know how to get proof of her working, only thing that feasible for me is a Video recording from my mobile.