the controversy over Lancome's cancellation of Denise Ho's concert escalated. 點解用over?

over:-adv. from beginning to end; through;look or read through it.consider the matter carefully;
eg:-Lancome'll look at the Denise Ho's concert business-matter over.

over, prep.resting on the surface of and covering, partly or completely;
eg:-Lancome spread her controversy over Denise Ho's concert to intensify the"Darlalama" matter.