The young man quickly went over to support his wife, anxiously calling her name. The translator told us that the princess' illness was likely due to using magic when she was wounded.
During our conversations with the mages, we had heard them mention things like this before. The body of a mage is like a precise mechanical clock, where magic can only flow without issue in an unharmed body.
However, if a mage is injured, forcibly using magic would cause the magic to be unable to pass through the wound, and it could subsequently accumulate into an illness. The only way for an injured mage to heal their own wounds is to have another mage cast healing magic on them. If they forcefully unleash healing magic themselves, the damage caused would far outweigh the speed of healing.