I am wandering if the older Potion of Strength now counts as a "Trinket". The Tavern Maid character my wife plays as starts the game with 5 potions, and she drew the Potion of Strength, which is a Trinket in the City expansion. Later she drew the non "Trinket" Potion of Strength and would have had to drop it, as she was already carrying her limit. Should we count the older Potion of Strength as a "Trinket", or does it count against her carrying capacity because it is a normal object?

Even though it is weird to have the same Object identified as a Trinket in one expansion and a normal Object in the base game, you have to play as written on the card. Potion of Strength is a normal Object in the base game and a Trinket in the City.

If you prefer more consistency, make a house rule.