My mother recently soaked her feet in cold water because of watering the ground, which caused her calf to ache and she didn't catch cold in cold weather. What's going on here?

My mother recently soaked her feet in cold water because of watering the ground, which caused her calf to ache and she didn't catch cold in cold weather. What's going on here? Muscle memory spasm caused by soaking in ice water at low temperature. When encountering similar low temperature, muscles will involuntarily spasm and produce pain. This is not a cold, but it can't be stimulated like low temperature. The solution is to soak the calf with warm water every day before going to bed for two weeks, which will gradually eliminate muscle memory and return to normal.