I would be relieved that she doesn't stand at the door and scream for you!!
I know you want he rin her bed, but if she is safe, I owuldn't worry too about it. Eventually, she will stay in bed.
I wouldn't tell her it's okay to sleep on the floor. I would encourage the bed - scold her as you see fit, tell her big girls sleep in bed, let her pick out some sheets, let her put a million toys in bed, tell her she can read a book in bed - whatever you can do to make the bed seem like the fun place ot be. It's a discipline issue, and you need to decide if it's a battle you want to fight right now and if so how you want to fight it.
But in general, she is probably a lot safer on the floor of a well childproofed room than up in a crib (tent or no tent). Odds are she would probably reject the crib now tha tshe has had a taste of freedom, and then you will have real sleep troubles. She is probably jus texcited by the new freedom and will get over it soon.
Unlikely, but is it possible, she actually likes the firmness of the mattress in the crib and disclikes a softer toddler mattress?