Hi- if there are no brown spots on the leaves, it is possible that a disease in the soil is infecting the plants. Fusarium wilt is common in Maryland and can cause wilting of stems and yellowing of leaves of non-resistant varieties. Infected stems will show a brown discoloration of the tissue directly below the skin (see photo in the link above). 

Please send photos of the whole plant and the specific symptoms and we will try to make a more definitive diagnosis.
Jon

Hi- the symptoms in the photos are consistent with Southern bacterial wilt. 

Southern bacterial wilt of tomato references:
https://www.clemson.edu/public/regulatory/plant-problem/fact-sheets/bac-wilt-tomato.html (see diagnostic test)

https://extension.umd.edu/resource/southern-bacterial-wilt-tomato-found-0/

https://content.ces.ncsu.edu/bacterial-wilt-of-tomatoes

We suggest not growing susceptible crops in this bed. Next year plant tomatoes in containers using purchased soilless growing media mixed 50:50 with compost.

Your friend may be able to plant the suckers from neighborhood tomato plants in containers now for a late crop. The planted suckers need to be watered twice daily until roots get established.
Jon