I threw my daughter out last year too. She was 20, and had no intention of getting or even looking for a job. Mind you, she wouldn't have had the time, she wouldn't get out of bed til at least 4pm each day!
Eventually, after coming home from work knackered one night and seeing the house in a tip and her loafing on the sofa still in her PJ's I snapped and told her she had a month to get herself somewhere else to live as she was out the door.
I think she thought I was joking, or hust mouthing off. Boy was she in for a shock when she went out and came back to her stuff packed in bags outside and the door locked!
She slept on a friends sofa for a week or so until she was able to flat share with her friend. She's still there now, and has pulled herself together a bit even going so far as to get herself a job!!!
I did feel guilty, but I reasoned with myself she was 20, not a child and it was about time she grew up and stopped sponging off me!
Stick to your guns lil, what you've done will eventually be the kick up the bum your daughter needed.
Good luck!!