Has nothing to do with luck, it has to do with the loot tables of Mel.
When Mel first came out she had very good items. Great bows, some good talismans.. But after a while they revamped some of the Peerless and Mel was one of them, ever since then she has had rotten loot. Not even close.
My main 2 bows were from Mel, and i had gotten maybe a half dozen decent ones that broke when enhancing, but i had 2 that succeeded and i use all the time. Not top of the line bows, but very nice ones.
Ever since the change, i have never gotten a decent bow off Mel again. I have never gotten a decent talisman. I have never gotten any loot from mel other than ingredients that i ever kept. Before the change, good loot, after, rotten loot.
I have also never received a hair dye, crimson, nor anything else other than an occasional parrot. And i have done hundreds of Mels.
But then again, since they introdued the super super dragons, people can probably solo her with a tamer/mage/archer. Or at least just need 2 people. So maybe you need crappy loot on her now.