Enchantment: Nature's touch not working on Red Monika


I played 2-3 Dungeons with Red Monika.
She has pistol with “Toucher de la nature” enchant (Natur’s Touch, 10% proc 40 heals on attacks).

I never saw this enchant proc.

Attention: this enchant come’s from “La Fosse” (the mine) , “Fontaine de vie” (life fountain).

Attention 2: I can’t remeber if I put her pistol in the “magic cube”.
(it seems magic cube keep enchant. At last, it keeps enchant tooltip. If I remeber correctly).