Q: "A female performer playing a guitar on a stage." Does this mean that "Theire is a guitar being played by a female."?
A: yes

Q: "A child in blue jeans with the cuffs rolled up and black socks taking a nap under a plum-colored covering decorated with large white concentric circles." Does this mean that "A child is sleeping."?
A: yes

Q: "an old lady walks down the street." Does this mean that "The old lady is on a couch."?
A: no

Q: "A boy is jumping forwards down a water slide." Does this mean that "The boy is wearing blue swim trunks."?
A:
it is not possible to tell