got a letter from Centrelink wanting my wifes payslips, need help with something here

I've been on jobseeker since 2020 (long story, no need to go into it).
My wife was working full time in the lead up to Covid, we had our 1st child in March of 2020, just before all the lockdowns.
She had 6 months of paid Mat. Leave
went back part time
in 2022 we had our second, she took 6 months of paid mat leave, 6 months of unpaid.
She went back part time.

Her average pay was around $350 a week, so $700 a fortnight.

She left that job and moved to another place, making about $485 a week.

Now I had an issue with the app where I could never add her employment details at all, I had spoken to centrelink at least 5 times about it. the app would crash and online it wouldn't save. something to do with the ABN we think.

This week I get a letter as shes left that part time job and they want all her payslips.

I've asked google and AI, both are saying I should be fine without having to pay back because most fortnights she was well under.
The problem is just 13 times since March 2020 did she hit more than what I'm seeing is the cut off.

I'm trying to find the right info here:
what is the cutoff and what she could earn per fortnight?
what are the rates?