You are wrong.
Federal statutes apply, not military regulations. You can not wear the uniform, or any part thereof, unless you meet the qualifications as stated in post #9.
By even participating in this Democrat booth, this woman is in violation of statutes, and, if still a memeber with military obligations (e.g., inactive Reserves) is in violation of military regulations.
If you reread my post I said that the person “may” have violated some arcane federal statute - but then again - so has every person who has ever worn any piece of the military uniform when not actually a member of the armed forces (according to USC 10, 771) - you will NEVER get a conviction based on that - especially as there are no penalties for violating that statute.