Just be mindful of what the consequences for her would be if you would go ahead with getting married and adjusting status. I understand that you don't want to be apart and you both would probably think it is wonderful, but she would be put in a very challenging position. She came to the US with the intention of a visit, and then all of a sudden won't be able to leave the US for many months, she might miss important life events (weddings, funerals, sick relatives or friends) and if she gets homesick, she won't be able to go 'back home' for a while. She'll not be able to work, would be completely dependent on you financially (unless she has savings).
Maybe the surprise of all of this is not a pleasant surprise for her.. You also mention she is "coming: on a tourist visa, so this is probably why people assumed that she is not in the US yet.