Concerning the shed... I would soak the snake in water (remember, if it's warm to your touch, it'll be hot to them). Fill a plastic tub up so that it comes about halfway up the snake, and let her soak for a bit (put the top on the container). After this is done, have her crawl through a warm, wet towel.

If this isn't enough to get the shed to come off, simply make sure her humidity is correct, and the remaining shed will come off with the next shed.

If you try pulling the shed off, it's possible to hurt the snake, perhaps even pull off skin.

And congrats on getting a boa! I love mine to pieces!