Although what you have done appears to be just fine, I would take a completely different approach than what you have done. I would use one fund per account for the next while, but I would use different funds:
63% S&P500 Index fund (yep, put all of it in that fund)
12.5% Vanguard Total Bond Market
Her Rollover IRA
22% Vanguard Total Int'l Index fund
3% any single fund you want (REIT, small-cap value index, or extended market index)
I would not worry have everything "perfectly" balanced at all. If you felt you need to rebalance, I would probably use "her Rollover IRA" at Vanguard to do so.
I think you will eventually come around to the idea that you might want more than 10% in fixed income.
There are many other possibilities. For instance, His Roth could be a single fund: Vanguard Total Int'l Index fund. Then Her Rollover IRA could be the bond fund plus another fund or two. And all rebalancing could be done in Her Rollover IRA.
His401(k): Mix S&P500 and Explorer for US equities
HisRoth: Total Int'l Index fund (set and forget mode)
HerRoth: REIT (set and forget mode) or Total Int'l Index fund.
HerRollover: All Bond fund, or Bond fund+REIT or Bond fund plus anything else for rebalancing.
This information has been prepared without taking into account the Sequestration, investment objectives, financial situation and particular needs of any particular person or company.