I'm sorry for your loss.
As for your remaining glider, it really depends on her personality, some do adapt and live well on their own, aand others show signs of stress, there is no way to predict for sure.
What you can do is keep taking care of her, maybe giving her more attention than she already received, and observe how she adapts.
If after a while she seems to adapt well, just keep on the same routine.
However, if she starts showing signs of stress and lonelyness, such as stereotypical behavior (always doing the same thing over and over again), then she may need a new cage mate (and then, there are several possibilities other than giving her up, you can also adopt/rescue another glider by then)