I got this banana plant from a reddit exchange about three years ago. In August, I took it to my parents place as I was house sitting for the month. It was beautiful weather for quite some time, so I had it outside in full sunshine. The plant was thriving, grew 8 new leaves and looked healthier than ever. I used fertiliser once a week, thinking it might need more because it was growing so much.
Then the weather changed, and unexpectedly the night temperature plummeted to 10 degrees Celsius. I took it inside the next day, and ever since the health of the plant declined.
I took it back to my place, where I don't have outside space. It sits in a south-east facing window where it receives full sunlight for about 4 hours a day. I'm down to one leaf that doesn't want to completely uncoil, one leaf that only has a yellow stem and two nearly dead leaves.
Any help would be very appreciated!
Pictures here:
https://imgur.com/gallery/ikj0U
I honestly have no idea what species this banana is. The green little thing in the last picture, is that a pup-to-be?