Hi Anna, Welcome to HealthcareMagic Forum.
Visiting a Hair Salon or Using Hair Dye is not a Predisposing factor for Coronary Heart Disease
which your Grandma is suffering from. It is Unhealthy Lifestyle. She needs antiplatelet and anticoagulant
medications along with regular exercises and healthy nutritious balanced diet which should include Fresh fruits and Green Veggies. She needs to take her Medications regularly and go for regular follow up.