Is anyone familiar with the Washington DC store locations?

Hello all 😊 and thank you in advance for your help!

My family is planning a three generation trip to Washington DC soon and my elderly mom has a ton of very specific food restrictions and preferences. We will be doing the touristy things, monuments and Smithsonian, etc. but our first priority when we arrive will be making sure she has food for the week. We are so relieved there are whole foods markets in the area, since we already know what she can eat from there.

1) Are all of the locations about the same or is there a "flagship" location in DC?

2) We are ok flying into any of the airports in the area if there's a great whole foods & accomodations nearby, even if we only stay there the first night.

We really appreciate your guidance and recommendations, thank you!