It's her thinking word. We all have words like that we subconsciously don't realise that we use all the time. Some people stretch out parts of their words when they're thinking or make long pauses mid-sentence. For other people it's physical behaviour, tapping fingers or looking in a certain direction. It's all part of the strange mechanism of how our brains operate when we are trying to think of something.
Remember old WIndows, up until WIndows 2000, where the comands was i queue, so if you swing mouse or smth it speeds up queue? The same is with Miko and "nye", it`s just pushes up priorities XD