Hi @plentyle and welcome to Mayo Clinic.
Mayo Clinic actually wrote an article about Herbal supplements and heart medicines that may not mix. You can read it here: https://www.mayoclinic.org/healthy-lifestyle/consumer-health/in-depth/herbal-supplements/art-20046488
Here is also another good article:" Xarelto differs from warfarin and other blood-thinning medications in its relationship with vitamin K. The explanation on the Xarelto website ..." --- Xarelto Food and Drug Interactions Guide: https://www.canadadrugwarehouse.com/blog/xarelto/xarelto-food-and-drug-interactions

Is she on any other medications?