There is no logic at all to this.
She is using SB's bedroom as a dumping group thus displacing him - instead of using the cleared outside shed or the usually locked (fuck knows why
) dining room. Both on the ground floor so easier to shift stuff from.
She is
choosing to sleep for 6 months on a sofa. Even though she is disabled. And recently the pain was worse than it had ever been. But there is still a bed in SB'S old room. And she gave away a sofa bed.
I could attempt a Venn diagram of the permutations she keeps suggesting but I know I'd still be baffled anyway.