I used to be a museum curator, so I always subconsciously pay attention to objects and the Agents of Deterioration that may be affecting them!
If I recall, any damage to her statues that I may have noticed came from transportation. So as long as you put it in one place and leave it there, it should be much safer than moving them frequently.
You might consider putting up blinds that you can open and close, or perhaps add a layer of sheers to your drapes, where the main drapes can be open, but the thin drapes block the full brunt of the direct light. If your windows are energy-efficient, they probably have some sort of a gas that blocks heat and some of the radiation that leads to color fading (fugitivity).
Glancing at some of my handbooks, I don’t see anything that talks about plaster, specifically, but as far as ceramics are concerned (if you have a ceramic statue), the thing you need to be careful of most is going to be heat and humidity fluctuations and their effect on the glazes. But if the temperature and humidity are pretty stable year-round, then a ceramic statue should be fine. For a plaster statue, I’d expect the relative humidity of the room to be the key issue, especially if the plaster isn’t sealed. So if you live in a humid climate, I’d recommend you keep your windows closed and the humidity relatively stable.
Edit-- here, you might give this a read-through, from the Canadian Conservation Institute, regarding the care of plaster of Paris objects.