The first thing I would do is build a dig box. This can be a big plastic tote or similar that you fill with a mixture of moist play sand and topsoil. The mixture should have consistency that is strong enough to hold a tunnel structure. Start a small pilot tunnel for her and then let her dig around in it and do her thing. Hopefully she'll be able to pass all of the eggs uneventfully. Give her baths after dig time and give her plenty of opportunity to drink and plenty of calcium rich food.