how tricky, you know there has been glue ear but you don't want to assume that's all there is to it. Both my kids had serious language delays. It was "easier" for me because we knew it wasn't glue ear.
For her problems understanding language, I strongly recommend the DVD "Teach me to Listen and Obey" which you can buy at the www.teachmetotalk.com website. This will show you how to start doing what a speech therapist will do.
For general guidance in improving your own techniques in interacting with her, (a crucial first step - you do not want to be messing around with flashcards and "can you say teddy - teddy" stuff right now) buy "It Takes Two to Talk", published by Hanen, available from Winslow publications for £32, the best money I ever every spent. The brilliance of this book is not just that it is clear, but that it will not depress or frighten - can be shown to relatives whatever their opinions about her not talking.
For some brilliant and wonderful ideas which will help any child but which if it ever turned out that she did have autistic traits you'll want to do as soon as possible, turn to "More than Words", also published by hanen, available from Winslow. But there are many techniques to learn and so I would buy "It Takes Two to Talk" first.
Have you tried putting photos of everyday events and people on the wall near, say, the back door? Visuals like this can be a bridge to understanding. As you get ready to go out in the car, you say, "we're going to Sarah's house", show her the photo of Sarah at her house, take it off the wall, take it with you - when you get to Sarah's say "we're at Sarah's house" and touch the photo again. Have one of home ready in the car. You get back in the car, you say "we're going home", you take away the picture of Sarah's house, you give her the picture of home - you go home. See what I mean? These techniques are used for autism but I wouldn't be surprised to learn that they are used for children with hearing problems too. They are not a substitute for talking, they lead to it.
good luck. I wouldnt' wait.