The mesh top does make viewing easier. Just checking if it’s secure and can’t be pushed up? Hamsters have done such things. It’s nice you’re getting to see her on the night cam.
With diet- their main diet should be the hamster mix which has the correct balance of nutrients and the correct level of protein. Hamsters need a lot of protein in their first year so a mix should have at least 18% to 20% protein (it should say on the packet). If it has less than that, you can supplement the protein with human food treats, as Elusive mentioned. If it’s human leftovers like a bit of chicken eg then it needs to be plain (no sauces or gravies). But best to put out about 10 grammes of hamster mix a day. Which is about two teaspoonfuls. They hoard most of that and then snack from their hoards. It may seem like a waste but it’s their natural behaviour to hoard food and they can get quite anxious if their hoard is removed. Dried food stays safe for quite a long time. There’s more information on saving the hoard on the cleaning tips article
It’s probably better not to give any sugar at all as Chinese hamsters are prone to diabetes and they can be quite ill with diabetes. There isn’t really treatment for it either. It’s thought that a sugar free diet can help prevent onset.
As a one off it is probably fine but better not to give things like breakfast cereals in future as they all contain sugar unfortunately. It may not seem like much but for a small hamster it can be a lot. I did manage to get some sugar free cornflakes once but there are easier treats to find!
They sometimes like the odd bit of pasta (eg a piece of cooked spaghetti if you happen to have spaghetti one day) as well as other seed treats. I sometimes give coconut as well. You can get a lot of these things from the bakery counter in the supermarket and they last quite a long time. Eg pumpkin seeds, coconut flakes (natural nut sweetened desiccated stuff), walnut halves, unsalted cashew nuts etc.
Monkey nuts (peanuts in shells) are really popular with hamsters and you can get those in supermarkets too. It helps to start them off with the shell by breaking a tiny bit off at first so they can actually break it open
So basically - no salted things or sweetened things. Their metabolism is very fast so a tiny amount of something is a lot for a hamster.
It’s a steep learning curve sometimes!