Lower leaves of flapjack plant drooping

by Dora
(Budapest, Hungary)

Dear Jacki,

I got a gorgeous Kalanchoe thyrsiflora plant from a friend of mine two weeks ago.

I live in Budapest, Hungary, the plant lives in front of my east-facing window which sadly doesn't get too much light due to the next house being too close.

The lower leaves of the plant started hanging lower and lower and I am very worried that it will die. I water it about weekly, the soil always gets pretty dry between waterings. It might be too cold for the plant so close to the window (temperature outside gets very close to 0°C lately, although my windows are insulated). Or it may be too hot for it there, my gas convector heater is right under this window, although it is set to minimum. Or it may be too dark for the plant there, but I can't provide it any lighter place in the apartment.

I took two pictures of the flapjack, one in the morning about a week ago, it shows the lighting conditions in the room, the other I took just now and shows how low the leaves are hanging. They feel a bit softer to the touch as well.

I would love to get any sort of advice, I really want to keep this plant happy.

Thank you,
Dora