She for no reason picks on and humiliates twinkle and she's so too faced as she acts fine with twinkle in front of all but when she's alone with twinkle she starts her emotional atyachaar on twinkle and twinkle says nothing in return out of respect for her mother-in-law; usha is a undignified and brainless woman who is driven by her insecurities and takes it out on twinkle just because twinkle, unlike usha's eldest DIL does not constantly put usha down or raise her voice against usha. Usha take's advantage of twinkle's politeness and respect for her and constantly taunts her to no end.
Just kill her off already, honestly!!!!