I haven;t grown eggplant for a long time, but the shape of the leaves look like eggplant to me. The color is brighter green, but that may be due to the flash.

I agree, the color is off, but I think it is an eggplant also

Well, I guess let it grow and see what it produces. And let us know when you know.

I also posted it on the Vegetable gardening forum and this is the response I got,

"Something in the Solanaceae. Perhaps Solanum nigrum or similar."

I never had this plant and have to wait to see the flower and the fruit on this plant. I'll definitely share it here. Thank you.

Thank you for checking with the vegetable people and sharing it with us. Solanaceae is synonomous with the more easily pronounced and remembered word (at least for me) 'night shade' which includes tomatoes, potatoes, peppers, eggplants and lots of ornamentals, and weeds. It will be fun to watch the plant and see if it indeed what she planted or a weed that blew in.