"even workers in the public sector like myself are likely to get above average wage increases this year."
Eh? Can you put that in English? What is an 'average' price increase? Are you suggesting that workers in the public sector are getting pay rises that equate to the cost of inflation?! If so, you might like to tell all those public sector workers on strike that they don't need to do this, as they are actually getting pay rises of 11%+. Certainly doesn't apply to me or anyone where I work - as a public sector worker where I work, pay rises are all in the region of 2-3% - so in real terms, we are all losing real income and the amount we can afford to spend on housing is lower than last year, not higher.
"Her mortgage costs will stay the same for 3 years so suddenly that feels more affordable. It’s like her mortgage just became 12% cheaper in 7 months."
Yes, but your daughter is not buying or selling, so will not impact on house price indices. People who are buying however will not all be earning 12% more (that's about double the average pay rise), while they will be spending 11% more (based on current inflation rates) on everyday costs not including housing. Then when you factor in that their costs to take out a mortgage will have gone up by about 30% in the last few months, and it's fairly clear that anyone selling hoping to sell for the same amount they would have sold for in May 2022 is living in cloud cuckoo land.
To be put figures on that. Let's say you wanted to buy a property of 300K. You have a deposit of 20%, so want to borrow 240K. In May, your monthly mortgage costs on a 2 year fixed rate at 2% would have cost you £1017. In Dec 2022, borrowing the same amount at a rate of 6% would now cost you £1546 a month.
Now even if your salary has gone up by a few hundred pounds in that time, your other expenses eg fuel, food have also gone up, entirely eating up any raise. Where is the extra £500/month to pay for the increase in mortgage costs coming from? And while your daughter won't be selling, who is going to be paying over the odds for your daughter's neighbour's house, when they sell?
I feel sorry for your daughter, for buying at the peak of the market, but as you say she can afford it, then she may be OK. However, for anyone who needs to sell at the moment, they are not going to be able to find anyone who can get an equivalent mortgage to the one she bought with. And cash buyers aren't going to pay thousands of pounds over the odds just for fun.