On the W-2 Wks enter all of the income as MD source.  Enter $0 for VA wages but leave the VA withholding.  If there's no other connection to VA you'll file a VA 763-S to get the withholding back (it might still have to be mailed in with the W-2 attached.)

Have your client tell their employer to STOP withholding VA taxes.  If they're friendly they can also START withholding MD tax (and may need to catch up on the missing first 3 months . . .)

Rick