What do you think about one rod across that whole wall, corner to corner? Hang it at ceiling height. When the curtains are open, they'd be stacked against each wall but I think the fabric would camouflage the width difference. I'm afraid two separate rods would emphasize the difference.

You could do one set of drapes that's technically full enough to cover the whole wall. (Pretend like there's more wall between the windows below.)

Or two sets of curtains. These ones are hung too short and too narrow, but you can get the idea.

One thing I've learned from experience is not to cheap out on the curtain rod -- get one that's the correct length vs the extending rods. In my daughter's room where I used the curtains a lot, my rings always got caught on the bump that an extension rod makes. Ugh. But I did get an extension rod for our dining room because I never close the curtains in there.

I hte plantation shutters so why not just a black out roman shade with an outside mount that should do the trick and yo can some fun with fabric too. also drapes and kids are not an ideal match and the roman shades need to be the type tha do not have strings hanign down

Could you remove the plantation shutters for now - save them if you think you might want to reinstall them later - and put up a roman shade for now? I agree with Patricia that they're a better look for a child's bedroom and it would solve your problem.

Thanks all, this is really helpful! I did consider removing the plantation shutters for now (they came with the house and are in every room), but this room faces out front so I am not sure that I want to have an inconsistent look for just these two windows. I will continue to think on that, and will definitely also be exploring the idea of one long rod across the whole wall.