Fenhua was from a powerful higher realm.
It was a higher realm who specialized in gathering a lot ingredients needed for the alchemy, but also cultivation and comprehension! She herself had achieved a lot thanks to her origins, but also from her special meridians!
Pink Lotus!
She has that meridians! She was born with these and so, the body cultivation was pretty much within her body from the very beginning. Fenhua had tailored her path and thanks to the good higher realm, the lady had become strong and popular in the whole sect.
Of course, gathering the ingredients is simple job and there are way too much higher realms that use these to survive and grow in strength!
Or at least keep themselves in their position.