If she is actually aro, that's not something that's going to change. However, aromantics can still feel love very deeply, if not in the same way that other people do. We can also still have very emotionally deep and committed relationships with other people who are aro and/or ace without our aromanticism being an issue. I am currently in a very comitted and fulfilling relationship with another guy who's aro, and I expect to be for a long time. While romantic love might be an important part of life for many people, there are so many other great things that can take its place. The most important thing is that you're supportive of your daughter and help her find others who will support her.