what I do while is this close is I get a good book and sit by the whelping box, and read,while my girl goes thru the stages, I watch them like a hawk , I check and triple check that I have all my supplies ready and just wait, if she wants to walk in the yard I take her in a leash so she can't get ahead of me.
I also make sure I have the whelping drink and pudding ready, the goats milk in case I need it, clean sheets for the whelping box, and wait, and wait..
best of luck and wishing your girl a safe and fast whelping..
hugs,