I don't see why not. There will be women who are knowledgeable on the topic and some who aren't, but I think that's true of men as well. Knowledge is gender agnostic.
I agree. If a woman does the research and/or is around men with beards she could be more knowledgeable than a lot of men. It all comes down to research and trial and error. If a woman is making beard products and has men test them and give feedback the formula can be adjusted and she can make a great beard product.