marissa holcomb was held up in channelview , texas , on march 31 .
robber held her at gunpoint and emptied $ 400 from the till .
she was fired a day later after refusing to pay back the money .
the store said she broke their policy by having so much cash in the till .
holcomb is five months pregnant with her fourth child .
the store have apologized and offered her job back , with $ 2,000 backpay .
popeyes ceo cheryl bachelder asked the owner to ` rectify ' the issue .