I don't think there's any maliced, Shubra isn;t that attractive really, look at her features- very ordinary, and she isn't pleasant, respectful or cultured as Saloni is...
Yes...that's what we (the TV audience) think about Shubra...though within Saat Phere, all her family (especially her mom) and friends think she is beautiful, and maybe Tara is jealous of that fact, and that's why wants Saloni for Nahar, so she still remains the beautiful one in the house 😉