Dealing with severe blood clotting after COVID

My ex wife, but dear friend, is struggling with blood clotting issues. Pain from major clots in her legs and lungs and trying to figure out the right balance between excercise keep the blood flowing and dodging the risk of stirring up blood clots that could cause damage to other vital organs. I read an article that blood clotting can is a cause of severe blood clotting in one third of COVID patients.
I am wondering if others are successfully or unsuccessfully dealing with the same issue?