Hi Andrea! I found 2 of these mothers yesterday. At first I thought they were Brown Widows but after capturing one and looking at her under a magnifying glass and then going online, I believe they’re either “Hentz Orb Weavers” (Neoscona crucifera) OR “Redfemured Spotted Orb Weavers” (Neoscona domiciliorum). Mine def has same markings underneath as your’s AND reddish ‘thighs’
Hi, this is Neoscona crucifera.