Hi,
I'm also in 7a and grow a wide variety of passifloras. Do you know what variety you have? If it's a cold hardy variety you can just allow it to go dormant and not worry about it until spring. I keep most of mine in a heated greenhouse but used to keep them inside under HID lights. They don't like the change of climate and will suffer from shock. I used to cut my vines way back when I brought them in and only left about 6" of stems. That way the new growth will be more acclimated to the indoor conditions. You can also root some of the vines you cut off. I cut back on the amount of water and fertilizer they get while inside but I do mist them. You might even consider running a humidifer. Not only is the low humidity bad for the plant it promotes insect infestations, especially things like spider mites and mealy bugs. A good grow light helps. Even a window with a good exposure isn't usually sufficient. You should have been feeding it over the summer. I wouldn't feed it now. I never fertilize a stressed plant but you might want to give it some Superthrive and/or B1 to help with shock. Once it's healthy again you can give it some food. Good luck.

Thank you very much for your reply, Karyn! I appreciate it. I do not know what type I have; the flowers have brilliant blue pistal-like structures with deep purple beneath them on the petals, and the petals are an off-white to yellow in color. I'm sure this info doesn't help much, but I do recall on the insert the plant came with, it said it was good down to 50 degrees Fahrenheit.
It has a lot of new growth since the last post, and I'm going to cut back much of the dormant stems, but leave the new growth. It is doing better, and I'll be investing in some Superthive soon; once I recover from the holidays!
Again, I appreciate your response! It's been very helpful. I don't want to lose this plant. Thanks again!

- Jess