Then it came to me: I'll cut the sleeves off, too. She needs shorty 'jamas anyway.
First I cut the sleeves off. Then I pulled them a little to curl them up (below, the right sleeve is pulled and the left sleeve is not)(I know, I'm so proud of myself for my detailed process pics).
Up close shot of scissor damage (somehow there's tulle involved):
Cut off as straight as possible:
I was going to sew a straight line and let them fray but the silky stuff was fraying too easily so I folded a little hem and sewed it with a zig zag stitch. Then I finished taking pictures in my poorly-lit basement (which has recently gotten brighter light bulbs; it's like a whole new room).