If anything, Jadis was admired by the Green Witch. I agree with some one who posted something on a different thread about Jadis not taking on any apprentices. Jadis knew she would theoretically live forever (she did not take into account Aslan killing her) she did not want anyone who would challenge her so she would not have taught anyone about her magic. In MN, Lewis tried to make a point in saying that the north country was the place to learn dark magic by having Aslan say that Jadis would grow stronger in Dark magic there. Thus we know that the north was a place where bad magic was strong, it might have been almost inevitable that the Green Witch would become bad.
Another thing that we may think of is whether the Green witch enslaved the underworld for the purpose of taking out Jadis and establishing her own kingdom in the first place. It is entirely possible that Jealousy rather than admiration was her motivator.
I have said in the past (also on other threads) that I thought that the green witch was part human and part poisonous-plant spirit. We know that the nymphs and dryads could marry humans because Frank and Helen's children married them. It is entirely probable that a seducing poisonous-plant spirit convinced a human to marry her and the rest is history. It would make the plant-like green and her desire to emerge from the ground and take Narnia very normal and the plant part of her explains her long life. It gives weight to the saying of Mr. Beaver, beware of things that ought to be human but aren't.