Welcome to Graybeard Outdoors! I wouldn't worry about the difference, the syn stock set weighs 1lb-5oz, a pallet wood set weighs 1lb-10oz, I would get the wood stocked model, if the recoil bothers her, put a Limbsaver recoil pad on it, that's not as easy to do with the syn stock unless you use a slip on. The wood stock will be easier to shorten if you need to, also.
Tim