I have never had a glider that age, mine were homed at an older age, so I don't know if it's age related. She may do better with a glider, most do prefer having a cage mate or more. However, maybe in the mean time you can try doing out of cage play in a smaller area, such as glider-proofing a bathroom and sit in with her there or try a screened tent (which a lot of people prefer). This smaller space requires her to spend time with you or at least closer to you.
When you are ready to find a cage mate for her, you cannot just put them together immediately. Do research on introduction protocol, and most of the time quarantine is required or strongly suggested, with few exceptions.