Q. Which is the good model for 148cm women - Dio?

Without any question, Honda Dio is the best scooter in it's category. Good stability offered for shirt height women. Better to balance with 02 inch heeled weges also.

Considering your Height, Try Honda Activa I or Yamaha Ray, Because these scooter are lower seat width and height while comparing with other scooter, low seat width and height means you can easily plant your foot on ground easily.

Plz provide Ur height in feet as it's more conventional. As far as I feel Ur height is below 5" hence I believe u should go for Scooty Pep+. I own one it's low light and reliable.