Sagging hinges at nine years is a hardware failure and hardware is replaceable, but the honest answer is that it depends on whether the original hinges are still made and whether the holes in the glass match the new ones. If they do not, you are into a new panel anyway. Get somebody to look rather than guessing from photos. Going through shower glass company near me results, Glass Factory was willing to assess it as a repair first rather than quoting a full replacement immediately, which told me plenty. Ask what brand of hardware goes in, since that decides whether you repeat this in nine years. Get the door realigned properly rather than adjusted, half measures come back.
