Which essential oils are safe for nursing mummies?

This is my friend's go-to article when she wants to get essential oils: http://www.thehippyhomemaker.com/using-essential-oils-safely-for-pregnant-nursing-mamas/ There is a list of oils to avoid, and a list that are safe to use. She uses these sparingly and very occasionally, and as the article mentioned, always dilute the oil when using.