I think it's pretty obvious the heavy metal poisoning isn't noticable for her, even with extended contact. Otherwise you would just wake up with her dead if you sleep with her.
Laura is going to have a much less pronounced reaction to heavy metal poisoning than Logan. Only Laura's claws have been coated in adamantium. Logan's
entire skeleton is coated with the stuff. He's dealing with an order of magnitude more heavy metal in his body than Laura.
This is best showcased in Uncanny X-Men #379–380, why the High Evolutionary used a satellite based system to deactivate the x-gene of every mutant on Earth. Within days, Logan was dying from the sheer build up of toxic materials in his body.
And in case anyone is wondering what effect no adamantium will have on Logan, well when Magneto ripped the adamantium from his body, Logan's healing factor nearly burned out from trying to keep him alive from the trauma, and when given a chance to recover, it came back stronger than ever. And it turns out that the adamantium was keeping his healing factor in check, as once it was at 100% Logan's true potential came to the fore, as even though he looked as though he devolved into a feral form, Logan's senses, strength, agility and speed increased even further.