This is exactly what the trading card says about her treats:
A Tableful of Treats
Afternoon tea in the colonies meant a trip to the parlor, where the table was set with delicate teacups and plates full of sweet treats. Cookies, called "cakes" were piled high into towers. Felicity might have also enjoyed fruit rings and flummery, a pudding made with lemons or limes, sugar, milk, and eggs.
After tea, the table was cleared. Sometimes the tabletop was then tilted sideways so that the table could be moved or stored along the side of the room, near the matching side chairs, until teatime came again.
Now, don't get me started on her "flummery." There is no way that clear green stuff is made with milk and eggs! And those limes on top. I know key limes are tiny but at 1:3 scale, those limes are about the size of olives! That might be some crazy atomic cocktail or a huge Jell-O shot but I will never believe it is flummery. *end of rant*