hurm.. okay.. well.. you may want to read up on the BOI about DTS.
Basically there's a chance your snake may be wild caught, so I would suggest that after she eats and defecates, take a fecal sample to the vet for parasite testing, just to be safe. Not all snakes will eat right away after being shipped, especially tree boas, they can be rather shy.
There are tons of different ways to feed and tricks to try, some things work sometimes, some things work for some people and not others, so you may have to try a few. The main thing is not to try too many things too quickly, you do not want to futher stress out the animal.
If she doesn't seem to be thriving at all, keep in contact with the seller and hope for the best, let them know what you've tried and what they recommend.. although like I said, you may want to check the BOI. I won't say anything else about the seller here as it doesn't belong in this thread.
If she was on frozen, go ahead and try that again in another 3-5 days. For tree boas, I like to heat up the f/t prey for picky eaters or ones I am trying to switch to f/t - hold it up real close to a lightbulb until it gets really warm, the tree boas love the heat. (make sure you're only heating up the pinky/fuzzy and not your feeding tongs/hand too!)
Try offering the prey from below, don't touch her on the head with it; if she ignores completely, try touching her side (not her face) with it and then if she turns to see what it is, slowly pull it away from her and see if she tongue flicks. If no interest at all, leave it on the bottom of the cage (if you have substrate, leave it in a deli cup or something). Turn off the lights, check to see if she ate it over the night.
If not, try again in another 5-7 days with the frozen offered. If no interest, you could try braining the fuzzy, or scenting with a lizard or some chicken broth, or get a live fuzzy and put in a deli cup or something it can't crawl out of, put that in the bottom of the cage, turn off lights and leave overnight. Sometimes they need the heat and movement of live prey to trigger the food response.
One of my atbs came in, CBB, had been feeding fine for the breeder but wouldn't eat for me. Finally he took a live pink that was left overnight, a couple more live feeding and then he finally switched back to f/t (which is what he was on before). The stress of a new home and new interactions can put them off food so try to be patient but if it starts looking thin or you get a bad feeling about how it's acting, get to the vet.
I hope this helps a little, I'm not an expert!