Being disabled does not entitle her to violate the rules of civilized behavior and the complex with impunity. Piling up garbage is not going to be allowed, no matter who does it. ADA rules protect her from 'discrimination', not the foreseeable consequences of her own behavior when she creates such problems for the complex. It would be a lot cheaper for her to pay a neighbor kid a couple bucks a week than the fines she'll keep incurring. If she continues the violation, they might even seek eviction. She should try to negotiate a reasonable resolution with the mgmt.