Hello, and welcome.
I'm so sorry to hear that your young kitten hurt herself.
When she jumped down from a height, she may have landed too hard or her legs may have twisted in the wrong direction and she caused a sprain or a strain. However, there's also the chance of a hairline fracture of the paw, leg, or hip, so because of her young age and her limping and seeming to be in pain, it would be advisable to have her evaluated in person by a vet, immediately. Some imaging, like an x-ray, may be necessary to reveal the extent of the damage.
Hopefully, it will be something minor, which a few days of rest will take care of. You'll most likely need to keep her in a large kennel with food, water, litterbox, cat bed, to keep her immobile until she heals. She will not like her 'freedom' taken away, but it's for her own good.
Young kittens do love to jump up on everything and also knock things down, so clear off all your breakables and sentimental items from the places she likes to jump up onto and also, train her not to go up there. You can put large tins or empty cereal boxes on high shelves, the top of the fridge, etc., to block her from jumping up there.
For now, though, it's important that she's seen by a vet in person to let you know the diagnosis and treatment, if necessary.
I hope all will be well with your little furry girl!
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