90 lbs. is awesome. Good for you. 70 more is nothing.
Do what you're doing now - just ramp it up.
I see you're currently walking....start walking at a fast pace. Or get on the elliptical. 35 mins a day at a high intensity just melts the calories off of me.
As far as kicking up your diet...cut out easy stuff.....candy/soda/sweets/fast food.
You've got a good base to start....now just kick it up a notch.
