The school year is roughly late August-December and January - mid to late May for the 2nd half of the year. The school year has a set number of student attendance days, and while the State of VA sets certain standards, each school district gets a lot of funding from local taxes. Demographics play into the scenario as well, and sad to say, there are some 'no-go' areas in the Tidewater region.
The Norfolk area is quite diverse; Norfolk itself has vastly improved over the past few years, but schools are not the best. If I were headed in that direction, I would look at Chesapeake (which borders the City f Norfolk on the south) or the City of Virginia Beach, but in VB stay away from the water, and look generally south of I-64/I-264. Chesapeake schools are far better.
Much as I love the grubby old City of Portsmouth, avoid it like the plague for schools. I've got a ton of info on rental apartments in the Norfolk area because I worked for housing developers in the Tidewater region, but its a huge PDF file. If your friend gets 'serious' about the move, PM me and will find a way to get her the info. Similarly, Newport News and Hampton have 'issues' in some neighborhoods. Remember that in the US, a child attends the neighborhood school; accordingly, people tend to choose where to live based on the school attendance zones.