I agree with Shelly, but this is one case where communication with her doctor is imperative. She is probably on blood thinners already, and you must communicate with the doctor regarding any supplement she is taking, especially those that would thin the blood. Otherwise she might bleed and be unable to stop.
So, give the doctor ordering the blood thinners ANY supplements you are on. Even vitamin e and garlic thins the blood so give the complete list to him so he can make appropriate decisions regarding her care.