I don't think we saw her ask. But I suppose the writers figured that with everything that had been going on in her life recently, it would have been only natural for Vicki to have asked for time to get away from Collinwood, so they dealt with introducing the issue and dispelling it all in one scene - plus it had the added benefits of providing an update on Liz and chiefly forcing Vicki to stay at Collinwood under Adam's threats. Though like others, I also liked how it showed how Vicki and Roger's relationship had grown from the early days. To say that scene was a far cry from how Roger had treated Vicki during her first months at Collinwood would be an understatement!
It was just a nice little scene in the middle of all the mayhem - something it was unfortunate that in DC's drive for bigger, faster and nearly constant stimulation of the audience, DS didn't do very often anymore.