It depends on the details of DW's retirement plan. Your best bet is probably to call up plan administrator. Of course, they may not give you an unbiased answer, so you'll need to dig up the details about the plan yourself before calling.
Personally, I prefer to have the money under my sole control, which is why when I left my last job I immediately rolled the 401k into my own IRA. There were no downsides--I called up Vanguard, they set up a conference call with the current plan administrator, and it was all taken care of in a few minutes. It was a piece of cake.