Standard training plans are out the window in this situation. Forget the taper for this race. The point of the taper is to give your body a chance to heal up from the minor aches and pains that you don't even notice while training hard; you did that the hard way, while resting for illness. Now your mission is to come back from the illness and get into the running groove again.

You need to build up the mileage, and peak on race day. It reminds me of my second half marathon, when I was coming back from a stress fracture of my metatarsals. I ran everything easy, no speed work. I slowly built my long run mileage up, and got to 10 miles a week before the half. I had no taper, because I had no hard training. Then I went out and ran the half at a deliberately slower pace than my first one, and still had to slow down after mile 9 for the recovering foot; but I finished and I felt good afterward. Six halfs later, that remains my slowest half marathon; but if I were to change anything about it, it would be to run it even slower.

Only running 10 miles before the half is fine physiologically. If it's your first half, it could be a mental challenge; but if you've run a half before, you already know you can go the distance. Treat your body gently. You can't get to the finish line if you don't get to the start line.

Given what we know, I would also agree with @MobyCarp 's advice.