It's not unusual, put it that way.
Basically, this was an application made outside of the rules at a time when the Home Office was in chaos. As far as they are concerned this is not a priority application, so they have stuck it to the back of the queue, as I think someone has already said. Really, the application was entirely without grounds at the time it was made, and the ONLY thing jenmnky has in her favour is that it has taken so long. But...assuming that it is refused (which I am sure it will be) she will find herself with no right of appeal, as she was without status when she applied. There is a chance that she will be granted exeptional leave, but it still make take more time to get it considered. Going to an MP may get the decision sped up, but this may still be a refusal, so it is a chance.
All of which her solicitor should have made very clear in the first place.
One thing - when you say there is no response from the Home Office, does that mean that they haven't even acknowledged the application?
Vicky