What age should a 24 yr. old child have to pay parents rent or find her own place to buy or rent?

My husb. & I paid for all of our eldest daughter's 5 yr. college & when she wanted to become an exchg. student to Japan, we paid for airfare, housing, tuition, books, etc. for that endeavor. She has since graduated from San Jose State Univ. with honors, (we paid for 100% of her college, books, etc.) She continues to work at the temp. job she held down while attending college, but now works 40 hrs. a week. When I went into my bank where I do my sole proprietorship business banking, the bank manager inquired about my eldest child & asked where she is working since she had graduated over a year ago. When I shared with her the situation she stated that B of A had the best International Banking program around. She shared with me that B of A wouldn't take a person into their Int'l dept without any banking experience. With that, she offered to 'create a position' just for our daughter & speed her thru a special training program that she would create, so that our daughter would be easily selected by Bank of America after a year's training by her. The bank mgr. knew that our daughter's degree was in International Business with a minor in Japanese. The bank mgr. then stated that B of A had the best International Banking program. I was elated & went home to share the great news with my husb., who then was also elated. When I shared this "great news' to my daughter, her only replyt was, "Well, I dunno know." I was speachless! I immediately went to share what had transpired with my husb. and he was also in shock. That was over a wk. ago. What should we do? She is also driving my husb. car and he is taking the bus to work, which takes him twice as long to get to work, as he doesn't want her to have to walk or take a bus. I think we've created a monster child/adult. What to do you think? Any suggestions of how to rectify this situation? BTW, we have two other children (one who is in his 3rd yr. of college & another child in her first year of college. Thx. for any constructive suggestions.