Basically if a lady is being escorted by a hotel guest, nothing will happen.  Hotel doesn't want to scare off their customer, you, so they won't say anything or do anything.  This is why the lady asked you to meet her downstairs.

It is completely safe and I would suggest maybe you both either dress up or dress normal as to blend in with the crowd during the time.  Don't want to look to obvious.

There is nothing to worry about though, she is more or less trying to keep herself safe.

have a great time.

This is very normal in my somewhat limited experience.  Some hotels require a room key to get up the elevators, so you have to bring the gal up with you.  Don't let it bother you a bit.  Have fun!

Thank you all for the good advice. I am especially happy with the consensus but as I said above was going to take the chance anyway ( she is that hot ).

Hey luv how are you doing?  Everything should be fine as everyone has said.  Just don't bring any attention to yourself and meet her maybe by valet or something outside and that way you guys walk in together.

Have fun while you are here and Happy 2009!