9 year old daughters behaviour help

[Mamabearrr83]

I have a 9 year old DD, 2 year old DD and 1 year old DS but my 9 year old just seems such hard work. I know her life has changed a lot from being an only child for a long time to suddenly adapting to sharing attention but even from a really young age she has been hyper. From the age of about 3 she has always been a show off around family members/different people and become really gard to handle but it has got so much harder now she's older. She will do anything to annoy her little sister (i know sisters do but its to a point its just unnecessary or she will purposely hurt her) she has no hobbies, won't play with anything for more than 5 minutes but can play a game on her phone for hours but I just feel she doesn't know how to be a proper child or I'm not sure what 9 year olds tend to do to entertain themselves?
She gets loads of attention and at home isn't the problem its usually when we're out visiting family members which has been the same from a super young age. She's good as gold at school which is great but I just don't know whether this is normal for her age or if there is something not quite right?

Tbh it sounds like she’s bored but doesn’t know how to be bored because she hasn’t had the opportunity to learn to.

If she didn’t have the phone, what would she do? I think you need to remove things like the phone that are there to ‘kill time’ and she’ll find other interests to fill it.

I find my kids are only worse behaved at my SIL because they’re bored. There’s literally nothing to do. My nephews are used to being sat on video games/phones. We just don’t go there unless absolutely necessary.

At home (10&8) they’re in the garden, draw, paint, playdough/modelling clay, playmobil, Lego, junk modelling, making treasure hunts or quiz’s, beads, writing stories or songs. Not always together, they’re quite happy in their own company too.

I’m a big believer that it’s good for kids to be bored because they’ll learn to fill the time.

Shes definitely bored and plays up more due to boredom
She isn't allowed her phone/tablet until 7pm now as a wind down before bed but from finishing school or throughout the day on the weekend she just seems to really struggle to find anything to play with/she's interested in.
Although shes hard sometimes at home she isn't anywhere near as hard work as when we're out at other peoples houses so it definitely seems to be more due to boredom!

Thank you for your reply