adding a shared Google Calendar?

In addition to my own categorized calendars (work, family, social circle, etc.) that easily sync between my iPhone, iClous, and iCal on my Mac, I use a shared Google calendar created by my wife (she's an Android and Windows user).

I have no problem accessing or editing the Shared Calendar on my phone or in iCal, but it doesn't show when I log into the iCloud.com web portal.

Any way I can get the Shared Calendar added to my iCloud calendar, so I have the same access everywhere?