K.F.
The best thing for your to do is just pull yourself together. You are the stabalizing force in your child's life at this time. With all the love in the world you must learn how to master making transitions and teach your child the same because life is all about transitions. Once your child was a infant, then a toddler, then a child, then a pre-teen, then a teen, then a young adult then an adult.
Why are you stressing out about something that is two years in the making? Please get it together, momma. In two years, your husband could receive a raise or promotion and you two could be moving to a bigger house in a better community. You don't know what two years will bring but it is good to begin the process of seeing what is available out there. It may be possible to find a school close to your job but you could have a different job in a different location in two years.
Long story short, it is wonderful you are getting prepared. Being prepared for the things you can prepare for should be part of making transitioning fun and exciting not anxiety producing. Try getting a new perspective on things. This will help both you and baby girl. Also remember some things are taught but others are caught. Is your daughter catching your anxiety?