Each baby handles this type of separation differently. Nursing is the embodiment of your love. Yes, she will probably miss nursing - but, most of all she'll miss being close to you. When you return, your little one may happily and eagerly return to your breast as soon as you walk back in the door, or she may be totally uninterested in nursing again. It's best to prepare yourself in advance for either reaction.
Separations can be hard on mothers as well as babies.
While you're away, express your milk as often as your baby nurses. This will keep your milk supply from beginning to diminish. It is also important, because as your supply diminishes during weaning, the sodium content of your milk increases, and most babies are not thrilled with the taste of salty breastmilk. About a week or so before the trip I would recommend telling your daughter you will be away. Explain who will be taking very good care of her, and that you will be back very soon.