Kestrel comes and spends the night on my windowcill

I have got a I believe young female kestrel comes in type evening when light is fading and stays until getting light in the morning. I think it is a she and have called her kylie. She leaves pellets every time. She has been doing this now for about 16 days, we try to avoid scaring her with putting lights on, but difficult as it’s an upstairs hallway light.Is there anything I should be aware of to help her as it looks like she may be here for a while.