The question is has your mum been self isolating or has she been recklessly going out, working, etc. If she has been self isolating or very limited in her contact which was socially isolated then she would to have had to had the risky contact with a carrier in the last 2/3 weeks. But you've not seen her and she's on her own. So that's an almost zero risk from her.
Have you been self isolating or have you and the family been going out, working, in contact with others? If not then unless you have done something risky in the last 2 weeks you are zero as well.
2 x zero does not equal risk. Be sensible and know your situation. She's your mum not some random 22 year old who for all you know has been going to illegal parities. She's not a nurse or care worker or working in Tesco is she?
I thought you were great when you commented earlier that you guessed you were BU after all. You asked, and you listened. We are all a bit mad in coronavirus and maybe as part of wanting to be a grown up you want to not feel like your mum can tell you what to do or not do what you want to do, And maybe there's some bad history we don't know about.
Or maybe not - being an adult and having real autonomy is about dealing with people who don't do what you tell them to and who tell you what they think without taking it personally and getting angry. It's about choosing the things that you react to, and saving it for the big stuff like the many dickheads on here that so many women just put up with.
You are free to ignore some opinions and equally part of being strong is being willing to take peoples advice on board. I am possibly the strongest willed woman I know - but I will ask friends things and I will listen. And do it if need be. Even if I don't want to.
So when I see some of the ridiculous comments on here about 'respect' and people getting all wound up about rules that are unclear and illogical without actually looking at the actual risks (elderly people who have self isolated are not a fucking risk. We are the risk for them) I just think it's all a bit pathetic and mean, and petty and tyrannical. And sanctimonious. My god,
Mums are easy to bully because you have all the power with grandkids and they love you unconditionally and there's always something in your childhood because they spent it telling you what to do. But it might be you one day - especially if your dd is watching,
You were BU unless she has been doing risky things in the last 2-3 weeks. Your were NBU if there's a pattern of her behaving badly to you, disregarding you, not loving you etc and that's not changed and she is not interested in you or your feelings.
But hugging her GD against your wishes does not mean shes doing any of that - and if you feel that then YABU and overreacting. Be kind. You have your DD and she is alone. One day you will understand and you don't want to teach your DD that it's ok to cast parents aside - because that's going to be you one day.