I have a keg like that. Mine is a pin lock style, and I got a little plastic pressure release attachment that presses on to my gas post to relieve pressure. It was pretty cheap from KegConnection
Thanks all. Sure seems like a pain. The first beer she is putting in there is for a St Patricks Day festival and should blow out in about 3 hours. Not much chance of oxidation there.
She is more concerned with oxidizing the batch she refills it with.