So really only one person needs to detect evil and that should guaranteed make her visible again in short order. Either she does nothing and the person finishes his detection in a couple rounds (which reveals her square but she would, I assume, keep the 50% miss chance) or she tries to interrupt him with an attack of some kind and becomes visible anyway. Also, I don't want to seem selfish, but I think the page should be the one to detect evil since Dalvin can cut through DR, gets a +8(total) to hit, and +7(total) damage.