the question is: why did she get a 136? Did she have an unusually bad day? did she misbubble? Unless it is one of these reasons, I sincerely doubt she'll be breaking 160 by December 2nd.
But if she has performed at least in the 150s on practice tests, I think there is a good chance that with some serious prep she could break 160 by December 2nd, which would put her in comfortable range for many decent schools.
Why a 160? Is she aiming for that? You can get into tons of great schools with under a 160. Not going to a top 10 school isnt the end of the world by any means. If she has her heart set on it though, then she could always transfer after a year. But you said her practice scores were all good, so its something else. If she practices some more and works out whatever you said was going on, she should be fine for December.