Our 6 month old child has been prescribed prednisolone cortisone(1.5ml per day) to be taken 7 days. but she only had her measles vaccine 4 days ago! we see it's a contraindication on google, should we avoid giving the cortisone?

No: Given the fact that she received measles vaccine 4 days prior and the low dose of prednisolone, the efficacy of measles vaccine is not expected significantly affected. I speculate you are having measles outbreak in your locale since measles vaccine was given to an infant under 1 year old. She'll get a regular measles vaccination at 1 year of age.