Hmm well there's a lot I would write about them but I'm not really sure what your friend needs to know. Hopefully she did her research before getting one?
I'm surprised you haven't found much online as there are some good websites about them out there. I'm going to PM you a link.
One thing I noticed is that it sounds like your friend only got one of them - and they really really should be kept in pairs. They are very social, and can become depressed and self mutilate if not kept with another glider buddy.
Is your friend able to buy a cage online? That's what most people I know who own gliders do. You can get a decent sized cage online, even sometimes from sites like ebay, for around or just under $100 usually.
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