Hello and welcome
How long have you had the hamster? She might still be a baby and very young and sometimes they pee when they're a bit scared, but they grow out of that quite quickly.
The Hamster Heaven is a good cage. However, female Syrians are notorious for needing a lot of space. But there are other reasons for bar chewing - it's usually stress and one thing that can cause it is cleaning out too often. You have lots of nice substrate in there for her so it doesn't need cleaning out very often - you can just spot clean the area where she pees (usually a corner of the cage) every 2 or 3 days.
It looks like you might have the tubes and penthouse in place in the cage and that can lead to issues as if they nest in the tubes or penthouse, then they get all pee soaked. Most people remove those and blank off the holes and just use the cage without them. The hamster's instinct is to have their toilet not far from, or close to where they nest - on the same level - so if they nest in the penthouse and try to pee in the corner of it, the whole thing becomes a soggy smelly mess - which then needs cleaning out more, which then leads to stress behaviours.
So the first thing to do probably would be give her a large house at substrate level (a shoebox or other cardboard house is ideal, but big enough to build a large nest in). And remove the tubes and penthouse and cap off the holes. To make a shoebox house you cut the base out of the shoebox so the house is open underneath, and keep the lid as a lift off roof. And cut a hole for an entrance door (at one end of one of the long sides ideally so the other end is darker inside).
The idea being, if they have a large house that's open underneath and sat on the substrate, they can have more normal behaviours. She'll build a big cosy nest in it and bury her hoards underneath it, buried down in the substrate. The hoards can be left for quite a long time unless pee'd on.
I'd do that for starters and hopefully you can fit a large house in. I'm not sure what the long green thing is on the right of the photo at floor level but maybe that could be replaced and the house go there?
The other thing is to weave some cardboard round the bars in the area where she's chewing. It'll distract her a bit and she'll have something else to chew on.
Female Syrians are notoriously energetic and can destroy cardboard or an egg box in minutes! So putting cardboard floor toys in can help too - eg toilet roll tubes (slit them down one side so they expand or she could get stuck in them).
One day at a time!