Huawei in Hot Water
According to rumors the allegation is that Huawei violated U.S sanctions against Iran by buying sanctioned goods either directly or indirectly from the U.S. and then authorizing the reselling of the goods to Iran.
Certain types of technology (for instance semiconductors with strong encryption) can be purchased from the U.S. only under strict contract conditions that they not be resold to embargoed countries which includes Cuba, North Korea, Syria, Venezuela, Burma, Côte d'Ivoire, Congo, Iraq, Iran, Lebanon, Liberia, Libya, and Somalia.
To make an arrest there is probably a paper trail, like something with her signature on it. Huawei might have resold the embargoed goods directly, or sold products with the embargoed goods inside.