Midnight 2-4 Sock Sprain - I try to walk with only one crutch but now my foot hurt again - 15 min

Even with a sprain left ankle need Midnight shopping some food for tonight sp she is now crutching from the car in to the store.
She has a sock over her sprained ankle and is using crutches since it has rain and she dont want to get her sock dirty.
When she has enter the store she firts walking with two crutches on the tip of her toes but after some time can we see Midnight walking around with only one crutch.
Maybe is this not a good idea for after some time her foot get sore and she must start using two crutches again.