Short naps no matter what

My 7 month old is now sleeping through the night. What we’re having trouble with now are her short naps. The most she’ll do is 40 min but they’re usually closer to 30-35 min. Very very very rarely she will surprise us and do a 1 hour nap but I couldn’t even tell you the last time this happened.

We’re trying to do the transition to 2 naps instead of 3 but with 3/3/3.5 wake windows her bedtime would be way too early with only 2 naps, so most days she’s still doing a 3rd nap. And the 3rd nap ends up being pretty late just so she can make it to bedtime. Bedtime is usually between 8:30-9pm and she will sleep 11.5-12 hours usually.

Tips on how to tackle these short naps? She’s also been short napper since like ~3 months.