My 5yo DD would absolutely love and play with your DDs wish list.
Kids tablet - my dd has an Amazon fire tablet, plays lots of games on it. Every year I load the PNP Santa app for my DDs on their tablets, they love it.
Barbie camper van - not got this but would love it. She has other barbie stuff, cars, dolls, playsets. She is getting the Malibu dreamhouse playset for Xmas.
Various Barbies (colour reveal, camping Barbie, etc.) - got these, has asked for a Chelsea reveal for Xmas as she got 2 barbie reveals for her birthday and other barbies that are hers or her sisters.
A Polly pocket bag with Polly pockets inside - we have lots of polly pockets, always get played with. Some are hand me downs from older sisters.
A wooden dolls house with dolls - we have one but it got packed away last Christmas for space and we never set it up again, dd would be happy if we did though.
Spirit playmobil house - I don’t know if my dd would play with this but she has asked for the barbie lego house.
Crayola Washimals - would love
Bath slime - would love
A telescope - could get a cheap play one or replace with binoculars, my dd loves hers.
Lol dolls - we’ve got lots as my older DDs loved them though they aren’t played with as much as barbie by my 5yo.
Your list sounds more for you than your DD and some stuff definitely more for when she’s older.
Personally id either choose camper van or house, certainly not both. If you didn’t want the cost of the barbie campervan the Chelsea playsets are good, my dd has a few. I think she likes Chelsea more as she’s the youngest girl in the house so relates to her. Crayons and slime are big hits at any age in our house.
Years ago my older DDs got fake barbie campers from Wilkos off a relative, they had no idea they weren’t really barbie, a fraction of the price. The other day in B&M I saw an areoplane playset that could pass as a barbie playset. I didn’t look at the price but I suspect cheaper than barbie prices.