Actually it does but in this context, what is being done is irrelevant.
25th Amendment Section 4 (reads in part)
....or of such other body as Congress may by law provide,...
So Pelosi would have to submit a law, get the house to pass it, then get it through the Senate and then for the Presidential veto and back for a veto override BEFORE her little commission has any authority to do anything.
Or she can just grandstand on this issue, deflect from the truly ill Biden, and use the lapdog MEdia to sow doubt, fear, and distrust of the President and his decisions