Is there a possibility to cure GI bleeding with medicine?

Hello doctor,

My mother has been diagnosed with probability of lower GI bleed in proximal jejunal small bowel loops through nuclear scan. She is a heart patient and had been operated in the past and got her two valves replaced. She has to take blood thinning medications like Warfarin. My mother had low hemoglobin due to blood loss in stool. But, it used to get resolved with changing the dosage of Warfarin. But, this time, she is getting blood loss on more frequent duration and thus doctors asked to do nuclear scan to check for any GI bleeding. She has been advised to undergo surgery to get GI bleeding treated. Please advise if there are still possibilities to cure her with medications. If surgery is required as a last resort, then which one would be less threatening?