First...we are talking Pekin bantam as in a chicken...also known as a bantam Cochin? (vs. a Pekin duck).
Bantam Cochins can be very good mothers.
All brooding hens get up once a day to eat, drink, poo and usually have a dust bath.
You are not at lock down yet, which would be tomorrow or even Monday.
If she is spending maybe 15 to 20 minutes to do her stuff, then going right back to the nest to settle and sit another 23 hours and some odd minutes, she is fine.
If however, she is lingering off the nest for an hour or two, she may not be very invested in things, and you could have a poor hatch as eggs will be getting cold, especially if your weather is cool.
However, I note you are in Australia. If your temps are pretty warm, many brooding hens do leave the eggs a tad bit longer since the ambient temp is warmer. I've seen them linger for 45 minutes or so with no detriment to the eggs.
I'd give her a chance. My bantam Cochins have been very good mothers. They did get up more with their first hatches, but settled in with the chicks. Subsequent hatches, they have been stellar.
You can candle to see how the eggs are developing to assess better. If things feel too cool, or you note she is really lingering away from the nest or appears to be losing interest, you can go to Plan B with a back up incubator.
LofMc
