A reputable business does not do this. It doesn't matter if it's an MLM or a bricks-and-morter business. Home Depot emails are just as annoying as those from an at-home distributor, so despite TF/Plano's comments about an MLM, I don't think you can brand any particular business this way. Andrea B. is right - a well-trained rep/distributor from a good company (particularly one invited into membership in the Direct Selling Association) would know not to do this. It's annoying, unprofessional and unsuccessful.
I think you first have to find out if SHE is sending you the emails or if you are somehow on a list from the company itself. I don't know this particular company so I can't tell from your post.
So I would try any of Laurie A.'s suggestions. What's happening isn't right. That's not how people buy jewelry, that's not how companies build loyalty, and that's not how good reps are trained. If her company is not offering free training to her, maybe she's in the wrong business. She may be just so excited about her new venture that she's inundating people. But honestly, it's not how to build an income.
I would spend less time asking her about how it's going and more time telling her this is overloading your system or your patience, and ask her what she and her company recommend to stop this. Approach it as if it's a glitch or a problem where you just got on some e-blast list, and not like she's intending to do this. Tell her the top companies in the DSA are forbidden from doing this, and you're afraid she's going to be branded by her friends and prospective customers as a nuisance rather than a reliable sales rep.