A nodule is another term for cyst and hers is quite small. Many do resolve themselves but if not they may need to be removed via laparoscope. Over 95% are benign. There is some good information on the health pages (top right) that you may want to look at. I'm sure all will be fine.
I'm glad she's seeing an Ob/Gyn.. I think Trudie is right, but we aren't Drs. and it's always best to get a professional opinion. Most of the time they will just disappear on their own. Most of the time they will "monitor" it for a few months to see if it does disappear. And, as Trudie says, I too feel she will be fine. When is her Dr''s appointment? Let us know how it goes.