Ok. That isn't really big enough then. Once a cage is 100cm or bigger they don't usually bar chew. However female Syrians do need a lot of space and some will even bar chew in a 100cm cage. It might come down to what you can find, whether you're prepared to do diy, and cost. The Plaza 120 Elusive mentioned is a really good size and is 15% off at the moment so only costs £85. Or you might be able to find a used 4 foot fish tank on ebay or other second hand sites. They might need a bit of cleaning up but a new 4 foot tank costs about £250 and needs a lid making.
They are not easy choices and some comes down to what you prefer.
The barred cages can be changed to perspex if bar chewing still happens in a larger one. Personally I don't think the Savic Plaza 100 would be quite enough for a female Syrian. It might be - Jas (Hank's female syrian) is in one and the bar chewing did settle down. You can actually turn the Plaza 100 into a tank though, as there are full perspex panels for it. But that doubles the cost of the cage, making it about £160.
A tank could be a good option providing it's much bigger than the current cage - it wouldn't be fair to put a female syrian in a tank to stop bar chewing, unless the cage still had a lot of space, as the stress would come out in other ways perhaps. So it comes down to more space basically.
There aren't many options bigger than 100cm unless you make a diy cage, or spend £230 upwards. Have a look at our cages list
I think the only commercial cages, without diy, that are 120cm/4 foot are the Rodipet Laola tank style cage (but rodipet say female syrians can chew their way out of that), the Savic Plaza 120 barred cage, or diversa 4 foot tank which is about £250.
I definitely wouldn't use a wood cage for a female syrian (like the pawhuts) because they are very easy to chew out of and need a lot of reinforcing to prevent that.