Does Sugar remember who she had turned into a toy? Waiting and waiting for the next chapter to come out, I was thinking that if anything would go wrong, Doflamingo would have an easy way out of all of his problems. He could ask Sugar to turn him into a toy and nobody would even remember why they were fighting in the first place.

The world government would turn against the strawhats and everybody would go on with their every day lives. Now this plan would be perfect if Sugar would still remember about Doflamingo after he had been turned into a toy, so she could undo her magic when all threats had vanished and go into hiding or something for some time to let is all pass over.

So was any evidence shown as to whether Sugar remembers her victims or not?
There's a way she can remember about her victims. It's mentioned in the manga chapter 738: 


  "Sugar is able to make a contract with her victims and control them,
  leaving them with no control over their own bodies."


Read about her abilities here:  One Piece Wikia - Sugar