Minecraft PE cannot connect to friends world?

I'm having similar issue. I started world on xbox one, then copied to minecraft (btu version) and can play that from xbox, but I cannot access that world from minecraft pe. I am signed in with my xbox live account in both places but still cannot see my saved
worlds from the other device

If I'm not mistaken, I believe there was a minecraft update to a new version where all previous worlds are locked and inaccessible unless you use the previous update

what? That really sucks then

Yes she (my friend) recieved the jnvite and hit join but after a few seconds it said cannot join world, do i need xbox gold to play with her on pe/pc

So... it appears you're having problems connecting to your friends worlds in Minecraft for Windows 10.

I would have them check their in-game settings in Minecraft under the main menu there, and make sure that Online play is enabled. Sometimes this is switched to being disabled and therefore they cannot join any online games and friends cannot join their game
either. Both you and your friends should check in Minecraft settings and make sure that Online play is enabled and friends are allowed to join. Then you can select which permissions you would like to enable for your friends when they join your world after
that.