If it were me, Missi, I would be out before daylight in the general vicinity of where you last saw her. Birds, as you probably know, are not inclined to fly after dark, so she should still be in the area where you last saw her or where you last saw her heading. You will want to walk on foot to look for her and listen very carefully for any sound from her. If she is bonded to any of your other birds, I would take them with you in carriers on the off-chance that they may call and she recognize the sound. If you have any recorded calls of your birds, I would play them so that Chloe might hear them and respond to you.
Can anyone go with you in the morning to help you look for her? The more sets of eyes you have, the better your chances of her being spotted.
Is Chloe skilled in flying downward? This is a skill that a bird must develop and is not something she will know how to do if she's only flown across a room to you. If she is high in a tree but has not practiced flying downward from a high spot, then it is unlikely she will fly down to you. She would either just sit and wait for you to reach her or you may be lucky and she will climb down to you.
If she is particularly jealous of one of your other birds and the attention you give it, I would be sure to take that bird with you in a carrier as you look for Chloe. If you find Chloe but she is too high for you to reach, your lavishing attention on the other bird may be sufficient motivation for Chloe to climb down. And yes, of course, take her favored treats with you to use to entice her.
I would print up flyers tonight offering a reward for her. You may not need them, but you should be prepared in case to disseminate as soon as possible. You will want to post flyers in vet offices, pet stores (because anyone who may have gotten to her ahead of you would likely go to a pet shop for food), and your local grocery stores.
She is not far, Missi. Keep your chin up and think optimistically. Best to keep a cool head and develop a plan for her recovery.