How old is your kid? Having more toys will not solve the issue. Do you play together with her? She may be bored as she doesn't know how to play with the toys or because there is no company. Does she switch from one toy to another after the few min play or leave the toys completely? If it's the former, try putting away the toys, only offer 1 or 2 toys at each time.
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Queen of 1 playful prince