Energy is shared, and that's how unschooling works. Whether I'm excited about something new, or my children are excited about something new, there's still newness and excitement enough to share.
"Listen and watch when they want to show you something. It might seem like a little thing to watch what your child wants to show you, but it’s important to them and it matters to them! The little things are the big things!"
I think that an unschooler's checklist should look more like the five senses and past/future than like "science, history, language, math, maybe-music-art-physical education." Because that model is prescriptive and limiting. And the other is descriptive and unlimited.
Being where you are, in a mindful way, with the potential and the tools to be still and know it, is the portal to a better life. Call it what you want to, finding yourself with your children will put you in a good place.
Helping facilitate a good experience is different for each person. It depends on what they are interested in and why. It depends on how they want to explore whatever it is.
Bring some of her interests into her world, not by suggestion, but by learning enough about her interests to be able to converse about whatever-it-is. Maybe even try it yourself. Find places or folks to visit where those interests are practiced, where she might have a dabble too. Maybe she'll want to dive deeper. Maybe not.