[It'd be so much easier if she were in person to tell her this - it feels so impersonal to write it out, but at the same time she isn't about to ignore the message, either.] [She has no idea what a keyblade is - aside from the name making her assume it's, well, some kind of blade - but that's clear enough that her situation is a serious one. More magical adventures, it seems...]
I know it's a little overwhelming like this, but I promise it will be. Time here is stopped, which means that when you return, it'll be as if no time has passed for you back home. Whatever it is you need to do, you'll still be able to do it.