I mean if you watch her in Lucky and watch Aish in Aur Pyaar Ho Gaya(boths first movies) you will see the huge difference.
And man oh man was Sneha terrible in Lucky, she just had a dead look in her eyes and dialogue delivery was horrible. I even saw her last hindi movie the Shutter remake and she has not improved a bit.
Aish had amazing screen presence and was very gracefully in her dances. She just had an elegant aura even on screen, Sneha looks like a lost puppy. A lost puppy whose dead inside