Hi, I am sorry you are going through this. I do hope it has got better since you wrote this.
You are both feeling upset because no one likes change as the fear of the unknown scares them.
So maybe let her know you will still need her just as much for advice even if you don't live with her.
Maybe consider not moving too far away so you can visit and have a meal with her once a week. It's quite nice to have someone else cook for you ;)
Let her know how your plans involve her - but at a comfortable distance of independence.
Also you might consider going with her to some clubs nearby (yoga for example) so she can make new friends (you can drop out later).
I think just reassuring her that you still need her and she's still your mum is all she needs.
I've stopped being so upset now as my son has started texting me asking me things like how to cook peas in the microwave without them blowing up ha ha.
Tell her you are as scared as she is of the unknown but together you will get through it .
Anyone else got advice?
Good luck ;)

Hi, as a single mom of only one daughter who just got married this past Saturday and who will be moving out after her honeymoon, I can tell you that your mother's anxiousness over you moving out is likely a big reason that there is so much friction between the two of you right now. She's likely feeling an overflow of strong emotions right now that are difficult to sort out and deal with all at once. On the one hand, she is more likely than not very happy that you are about to begin this next chapter of your life - she loves you and wants you to be happy, But at the same time, she is likely starting to feel the sadness, anxiety, and grief she will be going through once you do move out. Maybe you can sit down with you mother one day over coffee or tea when things are calmer and you are not arguing and you can tell her that you notice that you two are arguing more lately and you think it may be related to your upcoming plans to move out of her house. Since i am going through this now as a mother, it's darned on me that I was never aware or helpful in the least to what my mom must have gone through when i moved out and got married. My mom and I were extremely close and looking back, I feel awful that I didn't stop to think of how my plans were going to affect her. Now please don't misunderstand and think I am trying to say you should't move out or that you shouldn't be happy ad excited about it. But I may help your mom a lot to hear from you that you recognize that this is going to be a big adjustment for her and that it will likely be difficult for her but that your moving out doesn't mean you'll stop being her daughter or stop needing her. I think from reading a lot of posts that one of the biggest problems empty nesters are facing is that they are aware beforehand that having a child leave home is going to be difficult, sometimes extremely emotional and life-changing but it seems their feeiings and difficulties are rarely if ever talked about between the son or daughter and the parent. And single parent empty nesters do have a more difficult time with this. So try to talk it over with her, reassure her and see if that helps. Sometimes just being heard and your feelings validated by someone else can do a great deal to heal broken hearts and less someone's pain & grief. Best of luck to you.