If Mayday had access to Emily (the first Ofglen) then it's not impossible for them to have access to the second Ofglen.
Not at first, when she was vocally in favour of Gilead, but eventually, when she spoke up to save Janine.
If Handmaids have died, and it looks as though many of them have, what will Gilead do now?
They were expecting to be able to "process" more handmaids than ever, so they must have an idea of where these women will come from.
They are going to have to replace the lost handmaids from somewhere. They'll be regretting sending Handmaids off to the colonies right now.