I am in this situation right now! Ultimately, it is up to you and your husband to make the decision but I would definitely discuss it with your daughter and at least see how she feels. Maybe she'll want to move, who knows. Plus, would you even be able to sell right now?
With my situation, I have TWO children in high school; my husband was laid off for a whole year before finding a job that is four hours away in another state. He has a cheap apartment and comes home almost every weekend. I was not going to pull my children out of school - high school seems to be the hardest on any child - in my opinion. We have been uprooted two times already in the past and I was not going to go thru it again. My children did NOT want to move; nor did I. I am quite capable of taking care of our house, although we have a huge yard that I'm not thrilled with; but if I am able to sell, I would prefer to get something smaller and stay here before I would move out of state.
So, in answer to your question - NO, you are NOT being unreasonable! Yes, it IS important, if it's important to your daughter! Good luck!!!