ok. I'll give you an example of my nana (mum's mum) who had her first child unplanned and got married, she then got divorced and remarried and had her 2nd child (my mum) who was sort of planned.
when she had my mum and brought up her 1st DD it was WW2. so a tough time all round. her 2nd DH also cheated on her during WW2 when abroad and they divorced soon after WW2 ended. No surprise that when she did marry for a 3rd time it was for financial security and though he wanted children she didn't.
anyways - my nana would sometimes say to my mum and her DSis - that she'd wished she'd never had them as she would've preferred a career as a solicitor (she worked in that field anyway), I don't think she ever mentioned not loving them but she certainly wasn't maternal or even very grandmaternal when my brother and I were her grandchildren.
FFW a few years when my nana was approx 70 and us kids were 5 or so and she DID love us and my mother but again it was more financial help. there was the love stuff but my mum often felt well not unloved but it was different. when my nana died about 90 years old there was a great deal of love between her and both of her DD, they all acknowledged it.
BUT it took a long time coming and a few years of love/hate/arguments etc. What was really touching was after my mum left home when she was a teenager there was a letter my nana left privately with her presents or gave to her at Christmas, detailed how sad she was her DD had left home, how her room was empty, really touching and nostalgic. my mum still has this letter and it was proof (even though they were rowing and maybe had fallen out before or after this letter was written) that her DM DID love her.
I think if there are any questions now therapy is the way to go as well as talking to the DD - it is NEVER too late imo/e.