I can't feel her ribs...

 Well, not unless I push in with a lot of pressure. She's only 2 1/2 years old, but she has been spayed. The vet said she was a little overweight the last time he saw her (when he did her rabies), and she's even fatter now...
  
Should I put her on scheduled feedings? 
Oh and she was a rescue, her mom was feral and she was wild as a kitten, noone could handle her. She loved me instantly and there was no turning back from there lol...so I have no idea what she is...just a DMH as far as I know...