You certainly can teach a 10 year old to meditate, but not every ten year old will be able to maintain that type of focus. But at this age they might need
If she’s a visual child, it might help her to have a peaceful picture (it doesn’t matter what the picture is, as long as she finds it peaceful and comforting) to focus on. (The more visual child in my life uses a family photo and small piece of cloth sprayed with her grandmother’s perfum)
the more tactile kid in my world uses a smooth rock that she turns about in her hands to focus on.
Meditation is good, but it’s not the only option, some kids will do better unwinding by writing in a journal, or a hot bath, or ending the evening with a boring mindless task, or even by carefully organizing their things for the next day.
Try several things and go with whatever thing, or combination of things works. It can’t hurt for your daughter to explore multiple means of relaxation - she may thank you for those options as she grows and her life and stresses change.