The reason why she had dared to do such a thing was because she had already made some inquiries.
The Divine Trials will start soon and during this period of time, the Immortal Realm's cultivators would be far too busy with their preparations to have the time to come bother her. That was why she had dared to do such a thing.
It would take a few months for the Divine Trials to end. By then, her powers should have grown stronger and she, as well as the Azure Dragon and the rest, would certainly be a greater match for those Martial Emperors from the Immortal Realm.