My mum is very much like this (dad died when I was small). I left home quite young, and basically had to learn to adult and deal with any problems myself, as she just couldn’t cope with any requests for emotional or practical support, she either used to get really stroppy and ‘how dare you ask this of me, it’s so inconvenient’, or ‘oh why did you tell me that, now I’m so worried and upset, oh this is awful, poor me, how will I cope with this’. She was also very unaffectionate. Very similar to OP, she would always chuck money at me as a solution to any problem, when really what I needed was someone to actually support and help me (so for example she would never come and help me do anything practical in my flat, or help me move house, she would give me money to get it sorted myself). In my early twenties I rang her crying that my then boyfriend had threatened to kill me, had a massive substance abuse problem, and I was scared to leave him, and she basically said I shouldn’t have told her that because now she would worry, and what was she supposed to do about it anyway?
I’ve learned over the years to be very self sufficient, and not to tell her about anything important in my life; so we talk about TV programmes, the weather, what we did at the weekend etc etc. It’s her loss as far as I’m concerned, and sadly our relationship is still pretty transactional; the only time I tell her about a problem is if it’s one that can be solved with money because I know she will happily help out (she’s well off financially) and can cope with that kind of request no problem, anything else sends her into a spin.
She isn’t a bad person and I know she loves me, just very limited in terms of her emotional capacity to help and support me, or to inconvenience herself practically for me in any way – as a fully fledged adult that’s not a problem, but as a young adult trying to find my way in the world it was very upsetting and confusing, and even now, seeing the young couple next door get so much love and support from their parents as they set up house and start a family is very poignant as I see what I really didn’t have.
As PPs have said above, now she’s getting older she wants to share all her sadnesses and problems with me and expects me to support her in a way she never supported me. Plus now she wants hugs and handholding and I love you's, which were never given to me as a child, I find physical contact with her very difficult. I suspect it’s only going to get harder as she gets older and more vulnerable.