Blood clots cannot be broken up, doctors say there is nothing left to do, need second opinion?

My sister had her spleen out, after that she had several blood clots form, they said they cannot break up due to their size and how many their are. She has been on blood thinners for years. She now had an enlarged artery burst and is bleeding internally into the area where her spleen was. They tried to go in through the two arteries where they thought it was bleeding, couldn’t get past the blood clot on one, and the other was not the one bleeding. Basically they say they’ve done what they can. Isn’t there a specialist somewhere that knows how to deal with it? Mayo Clinic also says theres nothing they could do. Shes a 30yr old Female

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