What cage does she have and what size wheel does she have? Some Hammies will chew if their cage or wheel isn't big enough for them (I'm not saying yours are too small but it's always easier to ask)
Does she get time out of the cage at all?
Some hamsters do it for attention, some because they're unhappy and some because they become obsessed.
Bar Chewing can sometimes cause tooth problems such as breaking them and can cause something called bar rub which is where the fur wears away on top of the nose and this can turn into a sore if it continues.
One of my hammies chews despite haveing a rat cage, massive wheel and freeroam time, he does it out of habit and obsession now.
Things you can do are offer more time, thread cardboard in between the bars so she chews on that instead, attach wooden chews/pegs to where she chews.
It's better to get her out of it now than further down the line