I have applied GCM notes 2 times, 6 months apart, and did not find any movement in the application.There's no way to expedite this unfortunately. There are many others in the same situation as you, which i know isn't comforting. You can try contacting your local MP to get some answers or apply for GCMS notes to see what is holding up her application. I would apply to extend her visa if you dont hear back in the next two months.