Hi debbie
We don't know when you might get the renewal form, we have had members on the forum who get an extension and then a few weeks later receive a renewal form.
What we would say is that 6 months before your claim runs out, ( during your 9 month extension) contact DWP to see what is happening and when they will be sending you a renewal form.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems