Dear L.,
First of all...congratulations on nursing your little daughter for a year! That is wonderful.
I am amazed at how many responses say to "just wean her".
I don't want to put guilt on you, it sounds as if you have a long awaited vacation planned, but I like what Michelle has said from Boise.
Have you considered that your milk will "drop" while on vacation? Your breast will be full most of the time. Are you going to pump while away? It's not just as easy as just deciding to stop breastfeeding. You are very bonded to your little baby as she is to you. I have seldom enjoyed our vacation time away from my children. I do ok for about a day, maybe two, then I get very antsy and want to go home...now! It drives my husband crazy, but how much fun am I without knowing first hand that my baby/ies are ok? As the children have grown it is not as difficult for me to leave for short trips, but think about taking her with and finding a very responsible sitter where you are going.
I have encouraged weaning, but have never had to "wean" my children. I have nursed all nine from 12 months to 2.5 years. My children have given cues that indicate that they are ready to stop breastfeeding, either they are too busy playing, learning to enjoy food, or just bored with nursing. She will give you the cues - I would sometimes limit breastfeeding to naps and nighttime as they got older, but they would wean themselves. She isn't ready. There is more to breastfeeding than just milk. It is very nurturing for both to breastfeed- so consider encouraging weaning slowly.
If you must leave her, at least she will be with your mother. What a wonderful woman! I am glad it's her and not me!
Take Care,
H. B. MOM (mother of many-9)