how are you going to care for the plant/s with out her getting suspicious during the grow? that should be your first concern! when they start gettin fat crystaly buds on them and you come home with a new twinkle in your eye after your frequent B.S cover up stories, shes gonna think your cheeting on her! now you have plenty of room for drying lol!!!!!!!!!
im just playin(kinda). if your problem is that shes sketched out about having a bunch of fresh stinky weed dryin all over the place thats understandable, its pretty rare to find a DECENT trustworthy girl thats down with that.
overall your options are: (1) attempt to dry/cure outside sacrficing quality,security, and mold. there are many ways to do this, none wich i know of that produce quality bud, hence schwag/dirtweed.
(2) dry it at your buddys sacrificing final yeild but assuring quality, count the number of stalks/stems hanging and tell him he can smoke all the popcorn bud, that stuff dries first anyway, plus you gotta hook him up for helpin ya! dont be greedy.
(3)the sketchiest of all is, rent a chill place for a month and do it there? look for a furnished place or somthin and dress nicely when you go there! you could bring the harvest in as it is your belongings in boxes and such, by the time neighbors start gettin nosey your already done and outta there.
i guess it really comes down to how you carry yourself throughout the whole process and how much you are growing/harvesting? if your only growing a few small plants for personal use that you dont mind sharing with a buddy and your girl then it shouldnt really be a big deal where you do it aslong as you can all stay freinds. if you are growing to make money you shouldnt even consider telling your girl or your buddy, its whats called being professionally paranoid wich requires alot of discipline and solitude the kind of mentality of the CIA.
good luck