Hi sunwyn,
You don't need her to notarize anything. As long as you have written permission, you are good to go. Be sure to keep records of what you harvest by county, and by day. This information will have to be given to the dealer to whom you sell.
Prior to the end of last year, if digger said they harvested 1lb 2oz from ABC County, between the dates of 9/1 and 9/15, we would write the harvest of that county on one line. Date of harvest: 9/1-9/15. However, they put the kabosh on that. We now much have a separate entry for EVERY DAY you harvest ginseng. More work for everyone.