a few blood thinner meds like XARELTO, Pradaxa, Eliquis and aspirin.
Your daughter has to watch her diet on Warfarin (coumadin). Many foods and supplements can thin the blood! I have 2 genetic factors for having blood clots.
Prothrombin gene mutation and Lupus anticoagulants. When they find the gene mutation ask if it's inherited! if so your family and if she has children should be tested to see if they have them!
Check the following links!
http://www.premieresurgical.net/pdf/Diet-Modifications-while-on-Coumadin.pdf
http://www.carymed.com/coumadindiet.pdf
There are other medications, maybe only one and I don't remember the name, that works differently than coumadin. It is normally taken without any need to take INR readings. This may be an answer if your daughter can not tolerate coumadin/warfarin.