Puppy won’t sleep in the day

So we have a 13 week old Frug (French bulldog pug cross) and she is great going in her crate etc, and at night she sleeps 9-2, wakes for a wee etc then sleeps till 5. But in the day, she won’t sleep longer than half an hour. It’s the same crate in the same environment but she won’t go back to sleep no matter what i do.

I always give her ten mins before bedtime to relax and chill, usually with a yak chew, and she goes in fine and nods off for twenty mins or so. Nowhere near the two hours she did a few weeks ago.

I do the awake for an hour and a half max then put her down, hoping for her to sleep an hour and a half at least.

Any advice welcome!