need help to lose a dress size by july! :)

hello everyone :)
my senior prom is on the 4th of july and i need to drop from a size 14 to 12 by then ( so around 1 and a half months)
would love some feed back!

i go to the school gym every wednes day for an hour and walk my dogs every day for about ten minutes and sometimes walk from school to home for about 40-50 mins and that's my exersise, i also have started to eat healthier since my fitness pal, and planning on going on a salad-for-lunch during week days at school. any more things i need to do??

much love <3:)