Almost 30 yrs ago, I gave up a PhD. It was the complete anathema of everything expected of me by family, friends and the academics around me and probably one of the hardest things I've ever done. It was the 'wrong' PhD subject for me and I wasn't enjoying it and also, 'life' was opening up for me, outside the 'high achieving' path I'd been on.
Decades later, not having a PhD hasn't stopped me doing anything at all I've wanted to do. Back then, within the 'smaller' world in which I lived, it felt like the worst thing in the world to drop out and disappointing my parents, still feels so awful.
However, stepping outside that closeted existence and finding that there were other paths to getting where I wanted to go, was a revelation.
I do admit to regretting not having the Dr title but it hasn't made any difference career-wise at all.
I think you need to decide if this is just one of the normal and almost universal 'lows' that happen when you're at that level, academically and having to be entirely - almost - independently driven - or whether this is simply not the right PhD or not the right path for you at this point in life.
You could so a PhD later on, even if it's harder to find that kind of time. You can do PhDs part-time or through different institutions, with more flexibility. You don't HAVE to continue on the expected path right now from one degree to another. There are lots of other ways to go.
I think the hardest thing could be your mum's disappointment. If you decide to give up for now, can you tell her that your academic track record, to date, shows you have plenty of potential to do a PhD at some point, if that feels right for you but right now is not the time? Help her to understand that she's supported you all the way so far and if you divert from her expectations, it doesn't at all mean that you're letting her down. It means that you're making a mature and wise decision at this point in life.
Good luck with whatever you decide to do. Either way, there's not right or wrong or absolutes. People achieve what they want to do in all kinds of ways and at all stages of life and I believe it's never too late. I'm now in my 50s and may still do a PhD at some point!