Roll "IN" to plan of death benefit 401(k) balance

[pmacduff]

401(k) Plan allows for participants to roll $ into their account from prior QP and conduit IRAs - plan doesn't get much more specific than this ^ regarding rollovers "in". Participant's husband dies. Would there be any reason that she cannot roll his QP balance into her 401(k) Plan? I know this may seem obvious and I am 99% sure that this is ok, but with all the recent changes I wanted some reinforcement.