I have a handful of cards that my daughter had me list. We've made a few trades and always welcome more. She has a bunch of cards she hasn't sorted yet so we'll be adding more.
Best way to connect is to add the cards you have to trade and mark all the cards you would like on your want list then if you go to your profile there is a trade match report. You'll find anyone with matches to trade with. If you want to just do matching on the pokemon and not mix with your own collection, you can always create a 2nd account for her seperate from your own. In our case my daughter's cards are on my account and she only marked cards from sets she's started as wants but she's open to anything we don't currently own.
Another good way to find trade partners is to pick a set you are working on and randomly select cards you are missing and see who has them to trade. You may only pick up 2 or 3 cards at a time but often times when I do this I'll find a couple for my daughter and a couple for my own sets as well.
One other tip is to share the link to this site on other forms to try to draw in more collectors. I bring this site up anywhere I talk cards of any kinds. Always looking for more Star Wars collectors. Tell your daughter to suggest to to friends. She may even find local trades that way.