You have in no way let her down. I will list what our eldest has cost us so you can see what that looks like.
Ds is in his final year. Actual costs, food £30 - £35 ish per week, that includes salmon fillets, mince and chicken and eggs, he has a set 2 week menu because he has a Tesco delivery (we pay the yearly fee for that) it includes making lunches so sandwich fillings too which would be ham, chicken etc. He cooks from scratch except for filled pasta and a jar of pasta sauce on days when he is tired.
Laundry, wash is £3.90 (£3.30 if choosing eco on the usual Circuit laundry) tumble is £1.90. Ds reckons at a push you can get 10 days worth of clothing in a washing machine, he washes his bedding and towels in another machine. This would be term time only or "30 weeks" which it isn't' because they usually finish just after their exams, for this year that is 29th May a whole month before his "term" finishes, same for previous years too.
We pay his phone contract sim only £10 a month from Voxi.
We gave him £100 a week term time only, which he has savings from because he has no course materials, rarely travels home due to workload and if they get together with mates it is in someone's kitchen/house and they bring their own drinks ie can of Kopparberg cider would be just over £1 per can in a pub that would be £4. That £100 covers food, laundry, any socialising.
His Grandad also gives him £50 per month, this he uses to pay Amazon Prime (student discount) Netflix, Spotify. He has plenty of money left over from both our contribution and his Grandad so has put that into a LISA for a house deposit.
Lots of students do not live lavish lifestyles of cocktails and brunches, sadly no one wants to see content of a standard student life in Insta.
I should add we paid and still pay for his clothes, a pair of waterproof trainers, winter coat, waterproof coat, summer puffa, hats, gloves, scarf, he has about 4 pairs of trainers, unbranded plain hoodies, t shirts etc. For Christmas he got JustEat vouchers from everyone so he could have a takeaway or two.