L.B.
Hello J. -
As far as preparing her, I would explain you have a boo-boo that can only be fixed at the hospital. I'd tell her you would very much like it if she could come and visit. Perhaps take a ride on the magic bed or go for a ride in the big wheel chair.
I have a 2 1/2 y.o. Dtr. as well. I realize our circumstances are vastly different but due to work travel I have had to be away from my precious for extended periods of time. I made a video tape of myself singing, dancing, reading books, etc. The tapes starts with me talking & singing like I do in the mornings then wishing her a good day - by the end of the tape I am singing and reading the stories I would to put her to bed. Throughout the tape I reassure her that I am thinking about her and can't wait to get home to her. My husband says it really seems to help. I also made her a small photo album of pictures of us and other family members. In addition I call several times each day. One other item is that I always give the care givers a heads up that I will be out of town and ask that they give her extra hugs & loving. When I return I always come home with some surprise. Sometimes its simply the peanuts from the airplane or hand soap from the hotel. Perhaps if you are able, try going to the dollar store before you go in and buy some small "gifts" for her for when she visits. This will give her something to look forward to when she comes to see you rather than seeing moomy in a bed not feeling good. Oh, another one I have done is to send letters with stickers or pictures to color in the mail. My daughter loves getting the mail and to have something just for her -- she loves that! I start by putting the first piece of mail into the box the day I leave. That way that first day she's already got something from me. Another for visiting would be if you could call her ahead of time and ask her to bring you one of her favorite toys to visit or pack an item you need like a comb or nail file. My daughter loves feeling like she is performing an important "job" for me.
I realize what I am about to say is soooo much easier said then done but...Don't beat yourself up if she is still scared and upset. Just love her - She will feel that more! You are going to be weak for a period of time. Try and do some prep work before you go in, if you can. And DON'T be afraid to ask for help!
I will pray for you and your family J..