Talk to General Physician on Covid Vaccination AstraZeneca

My mother got vaccinated before 3-4 days of eid and she was complaining about pain in her arm the injection site was normal thought but now there's bruise below the injection site which was not present before but appeared yesterday and faded bruise on injection site I'm afraid whether if it's normal bruise or blood clotting because she got her first dose of AstraZeneca vaccine Picture attached for reference.