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is a medicine that is used to inhibit the formation of clots in blood vessels by causing inhibition of aggregation of platelets. And stroke
or Heart Attack
occurs when blood vessels supplying the specific area are blocked by clot or detached clot (emboli). So clopidogrel helps in preventing clot formation and consequent stroke.
In higher doses inhibition of aggregation may cause bleeding also which is "cost of doing business". Nasal bleeds in her is due to clopidogrel. Kindly discuss with her attending doctor regarding the problem so that he could either change or reduce the dose if possible.
Hope I cleared your doubt.