The accountant (8)

Mellissa wanted to eliminate the threat of Olga without physically harming her. She decided that she will make her look like a fool with untrustable in her work. Olga was a manager of small convenient store that she shares with other friends. She suffers from osteoarthritis that make her on some NSAID. What nobody knew is that Mellisa was a certified nurse and studied business after that to stick after few years into business. She went to a beauty shop and got a wig and fromthe corona era she used a mask and went to an old friend who gave her a prescription for some restriced medications under the name of Olga herself. She went to a mall and in the bathroom she made this simple newlook. She hardly identified herself, she went to the pharmacy in a nearby town using public transportation and got the medications, and was smart enough to pay everything in cash and left her phone in her bedroom so that no electronic footprint is left