Trees are extremely sturdy structures. If you don't evaluate your child's abilities, climbing trees can pose risks.
To climb higher on a tree, you will need to use both your legs and hands. Your child must be capable of using both their arms as well as their legs to keep the balance.
Your child must be able easily move between branches. This will require strength and agility.
Don't force your child to climb trees if she isn't ready.
You can still enjoy climbing a tree together by sitting on the lower limbs or using a ladder. Or you can sit on a branch and read books to each other.