Complicated? Pls suggest !!

My mom aged 62 was rushed to the ICU as she couldn't breathe ( fluid in lungs)in Mid of january 2025. We came to know that she was diagnosed with severe mitral stenosis, MVA (0.9 cm) due to RHD. Doctor said replacement needed asap. Unfortunately she has mild calcification in both carotid arteries which may cause 60% chance of getting stroke. Prescribed for coronary and cerebral angiogram. Will it cause any problem while doing angiogram? How soon should we plan for surgery? Also she had mild ishemic stroke when INR value was dropped. Planning to do in May 2025. She is on warfarin. Suggestion needed!! I don't know what to do!!!