Your sister is so good to you, so you should choose carefully. You should express your gratitude to her through the right gift, and at the same time congratulate her on her promotion. Here are some suggestions.
1. Your sister is a girl, so she will definitely like some things that girls like, such as a DIY necklace with her own name, some fashion accessories, etc. After all, girls love beauty.
2. Since your sister has moved to a new office, you can give her some items that can be placed in the office, decorations on the table, ornaments, or decorations in the office. For example, a music box, an inner-carved crystal ornament (you can also put photos of the two of you in it), and the recently popular sun jars, etc. When she sees these during her break, she will definitely think of you.
3. In addition, you can give her DIY chocolates that you made by yourself, so that she can feel your heart and feel sweet when eating them. Or gold-plated roses, women love roses, and gold-plated ones will not wither and can be placed in the office all the time.