litterbox and house levels

ok…so for those of you that know kush you know that she now is about 7 weeks old. well…we never let her upstairs. we have gated off the upstairs as we only sleep upstairs and shower upstairs so its really pointless. well…the dog is crated at night upstairs and thats her best friend so tonight we forgot to put up the gate and here she comes! so i put her back down put up the gate grab a glasso water and as im coming back up the steps i look up and shes at the top of the steps! she climbed the gate! she wants to be with her sister pooch!

my question is…we only have one litter box. and its obviously downstairs. what im worried about is her going potty upstairs even if we leave the gate down. now i know that ill eventually have to buy another litter box but this month some stuff came up and we are litterally penny for penny strapped. she hasnt had any accidents at all that ive noticed and im pretty sure she cant be that good at hiding poos and pees or id be smelling them even if the dog was getting to them to try and save her hide. (not that id actually do anything to her…just an expression of speech lol). do you think she would be ok? or should i try and rig it better to keep her downstairs until i can get anothee litter box? me and the hubby have pretty hectic schedules right now and cleaning up poos and pees would just be too much of a headache that i dont know if i can muster up the enegy to do ontop of everyhing else on my plate. because when i say me and the hubby…i mean me.