Target INR is at least 2 ideally between 2 to 3.
Increase warfarin dosage to 4 mg once a day ( 5 pm, to avoid interactions with major meals) as INR target is not achieved.
Check INR after 5 days.
She is 75 years old so it's important to know for which heart condition she is taking warfarin.
Next Steps
Share documents so that I can know why warfarin is given and other medications she is taking
Health Tips
Avoid green leafy vegetables