https://www.entitledto.co.uk/
Use this site, it's always been really accurate for me.
This is what I wish I'd been told when my DC father fucked off -
Don't rely on father paying maintenance, even if you go through a CMS claim, he may leave his job, never include it in her budget.
I used to work NMW (44 hours PW) and my tax credits, which I believe are gone or going now, they were a huge help for childcare fees.
I also rented a house with another single parent which helped us both massively.
However with benefit of hindsight, I'd definitely recommend working less hours and getting all the top ups she can, because I had this view I was letting my DC down by not working constantly to provide, I missed out on a lot.
She can smash the hours in when her DC is older.
If she budgets, pays any debt and doesn't get new ones, makes plans to better herself through education or learning to drive if she doesn't already, it'll help her when she is ready to find a career if she's able too.
My tips would be second hand clothes for children, using social supermarkets for low income people, frozen foods and bulking out meals with beans and lentils. Learning to cook will help her not want to live off of takeaway
Look for days out on Groupon and make packed lunches wherever you can.
Children's activities don't need to be really pricey, urban farms, beaches, woods, playgrounds etc are absolutely fine. Playdates, making crispy cakes and arts and crafts with stuff from b&m is ideal.
Fb marketplace and charity shops for toys.
Don't waste her money on unnecessary shit such as a million sprays to clean the house, bleach, washing up liquid, polish and a multisurface cleaner are sufficient.
There's so many traps for your cash now, say you go to home bargain for "a few bits" you end up with 20 things that do one job, I get it, we all do it, but especially if she's not working she'll have to be absolutely cut throat about what spending habits and traps she falls into.
I drill this into my kids, plan, prep, budget.
They ignore me but hey ho, I've tried!