How should i prepare my toddler for her 1st day to playgroup/pre school?

When my daughter was about to enter playground, I started bring her out to playgrounds and indoor gyms more often so that she gets expose to being around other kids her age. When we go home, I would ask her about the day and was it fun for her. She would say yes, and I would say wouldn't it be more fun if you have friends to play with everyday? I kept this up for a week straight and on the first day that I dropped her off and school, she forgot to say goodbye to me