The others wrote so very good things, I can’t really add much… Or so I say but of course I will…
I am with @PauL, just cut out a lot of carbs, preferably the worst types. My SO is a high-carber (and slim while I am the fat low-carber. because he is more active and more disciplined and vain. he VERY easily gains fat but he just don’t overeat) but he is health-conscious and cut off added sugar ages ago and we don’t eat overprocessing things but make our own food from scratch. We do have processed items but they are okay ones in smaller amounts, cheese, not sugary sausages and the like.
When I went low-carb and was careful not to eat unnecessarily much, I lost a decent amount of fat. Not nearly all what I had but a big percentage. I was very far from keto (I couldn’t do keto back then, I got unwell right away and had to quit) but I ate about 80g net carbs and that isn’t so very high compared to the norm… And it was effective to some extent. I felt better too (even though I felt pretty healthy on high-carb, there was room for improvement) and it was motivating!
Maybe she should just try things, without the pressure that it should be followed for months or years…? Maybe it will be easier and more beneficial that she would think!
But taking useful steps still should be doable if she is serious about a healthier and not overeating new woe… I personally saw no hardship in just cutting out added sugar (but people say it’s hard so it’s individual) as I liked to make my food anyway and I could kept my sweets, I just used sweetener. Way less sweetener than sugar as sweet perception tends to change… (Now I barely ever eat any sweetener but 14 years passed and things happened. I still have desserts every day.)
So maybe it seems scarier than it would be? And maybe it would be fine to go halfway or how should I call it. One can’t do ketosis halfway but low-carb works for many people, it only was good for me temporarily but it was needed, I liked it while it worked and it wasn’t so bad for off days either, definitely better than high-carb!
Focus on some nice protein (meat seems to work the best, not all are the same though and it’s individual how satiating the different meats are) is a nice advice too. It is easy to eat a ton of food after a bunch of protein for many of us BUT it is easier not to do it if we put in a little effort. I only got maintenance level this way but it still was way better than the usual carby overeating and it wasn’t just the macros, I felt less someone able to make good dietary decisions, the urges were worse, the hunger more annoying…
So I say if she is serious, try to do low-carb at least, maybe it will be awesome and not so hard. My low-carb was easier than my high-carb, I really didn’t feel I miss out things (well there was the occasional party or something but most of my days were easy low-carb, more enjoyable than my high-carb times and I pretty much enjoyed eating all my life). But keto, even with a generous amount of carbs was awful and impossible in the beginning. So I did low-carb and all was well for a while.
Even now, some keto styles would be impossible for me while others are lovely and easy for a while. We may need fine tuning to get our sweet spot that is effective and we enjoy ourselves enough not to quit. It probably disappoints people who want something simple and general and works for everyone - but life isn’t like that. I find it interesting and exciting to figure out what works for me, I love experiments, they are fun… And we are subject to change, the woe that works for us now may not be perfect in a few years…
Good luck!!!
I wonder if the kids would eat low-carb ice cream. I think mine is tons better than anything I could buy but I am not a kid. Keto sweets are pretty good, at least mine, my family members like what I make - while it’s not so good regarding the non-sweets items… Keto makes sweets very easy and if done well, they are quite nutritious and tend to taste better than store-bought ones but of course, it depends on the person.