I don’t use any added nutrition just potting soil that comes with nutrition. I use tap water that I let sit in sun for a day or too. It’s normally 60°-70° but dropped down to 50° the past week. please lmk if yk what’s wrong or have an idea of what’s wrong. Thankyou

What is the pH and PPM of the soil runoff?
Looks a bit like over watering. If not that then she might be hungry, what kind of potting soil did you use?
How old and how tall is she? That pot looks a little small but it's hard to tell from the picture.
Can you post a picture of the whole plant?