Congratulations. Those aren't the easiest trike to find in running order.
My niece was started young on 3 wheelers. Riding with here grandpa for a while, then got a 50cc Honda motorcycle of her own. Later she got a ATC110 and also moved up in motorcycle size. I encourage her to come over and ride as much as possible. It's a great thing for anyone to learn to operate different types of vehicles, but especially for girls. It'll help them be more secure and independent, two traits very applicable to a successful and happy life.
The story of three wheels and a man...