The following picture has often been associated with the squad. But who is the lady on the leftmost?
It's slightly blurry, but the image in your question is captioned with the names of the four congresswomen:
Jahana Hayes is Connecticut’s first Black Congresswoman, first elected in 2018 and again in 2020.
She is not typically listed as a member of the Squad. That informal group originally consisted of Alexandria Ocasio-Cortez of New York, Ilhan Omar of Minnesota, Ayanna Pressley of Massachusetts, and Rashida Tlaib of Michigan. Since 2020, the Squad has grown to include Jamaal Bowman of New York and Cori Bush of Missouri (The Squad (United States Congress).
Hayes is fairly progressive, and her Republican opponent in 2020, David X. Sullivan said in a campaign ad, "Hayes hangs out with the squad — they’re too radical" (Jahana Hayes, Connecticut’s 1st Black Congresswoman, Wins 2nd Term), but even he didn't claim that she belonged to that group.