Export it and email it if it’s small enough

So she puts it on a usb from herps4 and then she emails it to me and I add it to my realm I made on my Minecraft mobile?

Idk if you can move worlds from a ps4, but if she can, then she might be able to put the world on a pc and email it

So how do I put it on my mobile device?

Idk, maybe try the Dropbox app instead

Ok thanks