Hi
Syrian live alone! I have a female Syrian too! Mine loves her wheel and she had lots of substrate as she loves to dig! She has big tissue boxes with holes cut into and she loves nothing more that destroying it to reach tasty treats! Mine enjoys veggies like broccoli!
Apart from that mine is really fussy and loves nothing more than making chaos in her cage!
To keep her happy I normally get some big tubes like pringles and stuff with subtrate and her food then she has to dig to find it!