How to make my pup go longer at night.

[Putanotherwashon]

My pup is 12 weeks today! She is doing well with most things, but she’s still getting up every 3 hours or so overnight.
She goes for a last wee at 10.30-11. Then goes to sleep happily in her crate.
She then gets up around 1.30-2.30 and again at 4.30 ish.
Both times she gets up she goes straight out, does a wee and poo and goes straight back in her crate to sleep.
I want to push the times on a bit but don’t want to risk her having to poo in her crate. Last night she started to whinge at 1.30 and I ignored her. She went quiet after a couple of minutes and woke me again an hour later.
What do you think? Will she just sleep through herself when she’s ready or do I need to do something differently?