kitten not eating enough

my 5 month old kitten eats one 100g pouch of kitten wet food a day and nibbles on a few of her dry food and she looks really skinny. i tried every brand of food she likes hi life chicken but still doesn't eat enough. she's really active playing around don't think shes sick ( still booked appointment to see the vet in 2 weeks time) how can i make her eat more if she continues not eating enough shes gonna be anorexic

Start with the vet visit.  Has she been wormed?  Is she due for worming again?  If all is well at the vets you might find changing her food encourages her to eat more.