@Lana Zambarakji I think this warrants a visit to the gastroenterologist asap for proper diagnosis. We can then help you help her navigate root cause solutions once she’s been evaluated by a medical professional.
With diarrhea and rapid weight loss, there could be various issues at play, some as simple as dietary intolerances or allergies (like lactose intolerance or gluten sensitivity), but also more pressing concerns like chronic infections, irritable bowel syndrome (IBS), and inflammatory bowel disease (IBD) leading to malabsorption issues. Has she ever been tested for celiac disease before? I’d also want to rule out hyperthyroidism.
In the meantime, here are a few things that she can try for rapid relief of diarrhea:
Remove dairy and gluten 100% (especially gluten). I linked handouts for each to help you navigate that.
If she’s willing to eliminate even more foods, I’d recommend she follows an AIP type of diet for at least a month to see if her symptoms resolve. I share a collection of AIP recipes in THIS video from the Gut Health Masterclass.
Consider a probiotic with the Lactobacillus Plantarum or Rhamnosus strain. I share product suggestions in the same video above.
Reduce stress as much as possible.
And depending on how long this has been happening, dehydration is a consequence of diarrhea, therefore ensuring she’s well hydrated and adding in electrolytes (ex. Humantra) will also be beneficial.
Hope this helps.