120a middle just before the mishna

The gemoro says, maybe this woman will already be divorced, but she will hude her divorce in order to still try to mess up her tzoroh, even though they are no longer married to the same man!

But rashi said on the top of 117b that a daughter in law has no hatred for a mother in law, if they are no longer related (If the husband is dead) the only chashash over there, is that, she lied about her husband being dead. But otherwise, we don't suspect hatred when 2 people are no longer related??

Avrumi Hersh, London england