I seem to recall there was something in her interview about how they'd brought the suitcase down from upstairs and were messing around playing a game to see if he could get in it or somesuch. The police interview is online if you search for it, she hadn't asserted her right for an attorney and she also had a LOT to say so it goes on a while...
I was totally prepared to believe she is / was an alcoholic, that they'd both got drunk, pranked around, that she'd decided to let him sweat it out in the suitcase due to feeling malicious and vengeful and left him for a bit, not expecting him to die, then fallen fast asleep in a drunken stupor. However, other people make good arguments that this was not the situation at all. In which case, how did the suitcase get downstairs in the sitting room and if it was brought down for this strange 'game' then how pre-meditated was this?
JMO MOO