by this point, they proooobably have done some digging into mara's life and found out mara gonzalez doesn't! actually exist! her life has been made up and credentials mostly faked but she is legitimately medically trained, OBVIOUSLY. CAN'T PULL THAT OUT OF YOUR ASS.
as they're on the trail, mara won't send any lackeys to take them out -- that's not the way she does things. she doesn't want unnecessary death, ugh.