How to avoid a danger nap?

[SamanthaVimes]

My 3yo DD doesn’t nap any more, hasn’t for ages EXCEPT in the car. Any time we drive longer than 5/10 mins in the afternoon she’s out like a light and then bedtime is a complete disaster.
We had a day out yesterday and she had a 20 min nap about 4 pm. She wasn’t asleep until gone 9:30. She just wasn’t tired (and she will not just play in her room by herself although we’ve tried to encourage this if she isn’t sleepy)

Is there anything we can do to keep her awake in the car? There isn’t space between the car seats to sit next to her (we have a younger DS) so can’t literally poke her awake.

Sing songs. Feed a snack like raisins that make them concentrate on picking them up and give them a little sugar rush. Open the window. Chat to them.

Giving her a screen is the only way to keep my 3yo awake in the car. Unfortunately she's now developed car sickness so that solution is ruined 😭

My daughter is 2 year old.
she woke up at quarter to 9 in the morning
having a nap at 5 to 6 at night.

should I leave her to sleep or wake her? It’s very risky