[cypher]

Welcome to HC & congrats on getting Pumpkin.

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If you only just got her for Christmas she will still be settling in but bar chewing is often a sign of boredom so you may need to make some changes to her cage so she has plenty to do, if you could post a photo of your cage set up we may be able to make suggestions to help.
There's also a thread on bar chewing here that might help.
Managing Bar Chewers
Which cage do you have, is it the hamster heaven? Tubes & penthouses like those on the hamster heaven cause a lot of problems especially with new hamsters & it's best to remove the tubes etc & just block them off with the blockers provided then provide a good size house with no base on the substrate for them to sleep in, a shoebox can make a good house if you don't have one yet or a similar size cardboard box with no base & a small door cut into one side.