I'm only child about to move out- my mum is vry upset-how can i reure her that i'm not far away & i luv her

I am only moving a mile down the road- but b4 i go im on holiday for 2 weeks and am movin out the weekend i get back. It has mainly just been me and her for years and she is upset but supportive- i can see how upset she is and this is upsetting me and making nervous about moving out. !!! I love her sooooo much i dont want her to worry or be upset.