No, don't feed her. They're really good mums and will just protect their young while they are on her back, she won't eat and the crickets will just annoy her. The babies will begin to come off her back once they've shed their second instar (shed) which is usually about 2 - 3 weeks after they were born. They will also then be a darker shade, not white any more. It's ok to separate them then.