I'm so sorry for your loss
Wow, 8 babies! Mom might be able to do it alone but to check if they're getting milk, feel their bellies and maybe weigh them each day with a gram scale. They should be gaining 1 or 2 grams per day at this age.
Here is a guide on hand-raising pups if necessary: http://www.degutopia.co.uk/deguhandr.htm