Great question! I can’t send a real picture, but here’s a little drawing you can show her.

Imagine Earth is like a spinning top that leans over — and it always leans the same way as it goes around the Sun.

```
SUMMER (June in the north):

      -->            <-- arrow shows which way Earth leans
  [Earth]        [Sun]
  The top of Earth leans toward the Sun.


WINTER (December in the north):

      -->
  [Sun]        [Earth]
  The top of Earth leans the same way,
  but now it leans away from the Sun.
```

The arrow is the direction the North Pole points. In summer, the Sun is on that side, so the Sun’s light hits us more directly and days are longer — warm! In winter, the Sun is on the other side, so the light hits us at an angle and days are shorter — cold!

It’s the opposite in the southern half of Earth, so when it’s summer in the north, it’s winter in places like Australia.

Try this too: shine a flashlight on a ball. Tip the top of the ball toward the flashlight, then away. You can see the light get stronger and weaker — that’s exactly the idea!