I'd let it go ... :/
Usually police have the discretion to issue a ticket for something. If she took an accident report it depends on the policy of the agency... Some require you issue a ticket for no proof of insurance upon completing your report. Or, you can cite them out at the scene for (In California) 16028(c)V.C.
As for the reg, 1 month is expired yes, but most cops I know do not write that since the DMV is ....blah blah blah in Cali. Its a good PC for a stop though

(remember: Officers discretion to issue a ticket...) usually department policy does not REQUIRE to you write every INFRACTION you see. (Letter of the Law vs. Spirit of the Law)
Usually if you come off telling an officer "what to do" they take offense. No offense to you, but L.E. officers have ego, and are used to doing what THEY do, and HOW THEY do it, not being told by someone WHAT TO DO. Even other cops annoy them when they are managing "their scene".
Good luck man, sorry to hear about your accident. Seriously though, That's why i now insure for UNINSURED motorists
I don't know the policies of the agency involved but if she's uninsured in California we can't just impound the car. Unlicensed yes....As for reg, it takes 6 months of expired Reg to tow the vehicle for 22651(o)V.C.-Expired reg, over 6 months.
P.S.-She's at fault for a collision, and probably will be issued a cite for her No insurance. So consider her getting a ticket which will be $700-1200 from court (in California), and also being at fault at an accident with the DMV.