From a lepidopterist friend of mine: “if they fall and crinkle the wing while its setting, it will permanently set that way and will be unable to fly. Don’t worry, the crippled butterfly will feed some spider or bird that needs to eat.”
So unfortunately the butterfly probably won’t be able to survive long enough to reproduce or migrate, but like all butterflies (and I say this as someone who loves butterflies) it’s an important food source for many other animals.