Their response is too vague
You are entitled to the credit as long as her earnings in 2025 are below 11,100 in 2025
For earnings between 7.2k and 11.1k it's reduced BUT ye are entitled to it albeit at a lower amount of a credit
So it's best to readd the credit and ensure earnings are below 11.1k in 2025
But they may apply the full amount and that's a risk because the more she earn, the less ye are entitled to and you'll be getting that relief via payroll so you could end up with a liability
Best to reclaim retrospectively claim in 2026 for 2025 and it will be applied accurately based on actual earnings and you'll get an income tax refund,
The credit is available when doing a PAYE return for 2025
What revenue are probably trying to do is protect ye from a liability