Welcome to Mayo Connect @adnanmuhammad
It sounds like there’s a little mystery surrounding your wife’s low platelet count. Low platelets can be the result of viral infections, medications, autoimmune disorders, bone marrow disorders or liver disease. Your wife’s doctors have already ruled out liver disease which is good. But it’s still not ideal to have lower than normal platelets.

Too few platelets, referred to as thrombocytopenia, can create issues with prolonged bleeding, bruising, frequent nosebleeds, headaches, etc.

I’m posting a couple of links below to give you a better understanding low platelets and low red blood cells:
https://www.mayoclinic.org/diseases-conditions/thrombocytopenia/symptoms-causes/syc-20378293
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https://www.verywellhealth.com/living-with-low-platelets-what-you-need-to-know-2252431
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Has there been a peripheral blood smear? This can be a helpful diagnostic tool. In a smear, platelets (and other blood cells) can be counted and assessed for size, shape which may indication specific disorders. It’s just one of several tests but it may help direct next steps.

Are your wife’s other blood numbers in the normal range? Is she being seen by a hematologist?