H.P.
M.,
You've got a whole lot of things going on at once. Wow! I am the military member in my family so I've got a bit of a different view point but I hope it will help.
My daughter was a bit closer in age when our son was born but I think these things will work for you. On the days when you are feeling good and you have some special time to share with your daughter, make a big deal of it... have a tea party, or go to the park, or something else that she loves to do. Remind her that even with a new brother/sister on the way, there is still plenty of love to share. Help her to practice helping mommy with the baby. Preparing the nursery and telling her what things she can help with will help her feel like she's still a valued member of the family.
Daddy's deployment... there are a number of things that can keep you busy... you can make a chain out of paper - one link for every week or month (depending on the deployment - you may not want to make the chain too long) & put the dates when she can tear the link off on each one. It will help count-down to daddy's return.
While I was deployed, I got to read books to my kids by way of video. I went to the library at the deployed location (sometimes it's a family readiness center) and they had a video camera in a room where I could read to my kids without being interrupted. I read the book and they would transfer it to a DVD from the camera. I got to send the book and the video home to the kids. My husband said it was like night and day. The kids were cranky before they got the book in the mail. Afterward they were better and they watched it all the time. They also looked forward to going to the mail box for more surprises. I sent a book home for each month I was gone. (depending on where he is there may be a limit as to how many books he can send home.)
another good suggestion is that every time she does something to help mommy while daddy is deployed or if she is good through the week, there will be a coin for her to put in a jar. When daddy gets home, you can use all the money saved to have a special party when he gets home.
I wish you the best during deployment and delivery; and over this holiday season and the next I wish you peace and joy.
H.