My 3yrold had her injections around 3wks ago and next day had chicken pox.now they're gone she has a rough goose bump rash all over?

Not related?: Did she get the chickenpox vaccine? Normally a reaction to the chickenpox vaccine does not occur until around 5 days after the injection. She may have been in contact with somebody with chickenpox from 1 week to 3 weeks before the rash, and the rash should be gone in a week or so, with may be some scabs left. the rash you describe is from something else.

See the pediatrician: Before you make a conclusion about the course of events above, it would be wise to have your pediatrician check out the skin and make a diagnosis. Vaccination reactions can occur immediately after a shot, or many days later, depending on the type of allergic response. chicken pox or Varicella, takes 7-28 days after exposure to show clinical signs and symptoms