Communication is the key
You can try to communicate with your child about her behavior and find out why she always likes other people's things, whether it is subconscious, envious or possessive. If we find the reason, we can prescribe the right medicine.
Cultivate interest
Some children are not interested in a thing from novelty to tasteless, and the interval will be very short. This is not too serious, but it also needs attention, that is, gradually cultivate children's interest in a thing, continuous interest and so on.
Appropriate punishment
Give the child appropriate punishment. You can try to get her to write a review and make sure she doesn't make a mistake once. If she makes mistakes again, she can be punished appropriately, such as reducing snacks, buying fewer toys and going to KFC less.