For reference in case of an unduly lenient decision by the court:
The offence of driving without due care and attention (careless driving) under section 3 of the RTA 1988 is committed when the defendants driving falls below the standard expected of a competent and careful driver - section 3ZA(2) of the RTA 1988.
The maximum penalty is a level 5 fine. The court must also either endorse the drivers licence with between 3 and 9 penalty points (unless there are "special reasons" not to do so), or impose disqualification for a fixed period and/or until a driving test has been passed.
http://www.cps.gov.uk/legal/p_to_r/road_traffic_offences_guidance_on_prosecuting_cases_of_bad_driving/#a30
Road Traffic Act 1988, s.170(4) Fail to stop/report road accident
Triable only summarily:
Maximum: Level 5 fine and/or 6 months*
Must endorse and may disqualify. If no disqualification, impose 5 – 10 points
Offence seriousness (culpability and harm)
A. Identify the appropriate starting point
Starting points based on first time offender pleading not guilty
Moderate damage/injury or failed to stop and failed to report
Band C fine Band C fine
7 – 8 points
Consider disqualification
Offence seriousness (culpability and harm)
B. Consider the effect of aggravating and mitigating factors (other than those within examples above)
Common aggravating and mitigating factors are identified in the pullout card –
the following may be particularly relevant but these lists are not exhaustive
Factors indicating higher culpability
1. Evidence of drink or drugs/evasion of test
2. Knowledge/suspicion that personal injury caused
(where not an element of the offence)
3. Leaving injured party at scene
4. Giving false details
Factors indicating lower culpability
1. Believed identity known
2. Genuine fear of retribution
3. Subsequently reported
http://www.motoroffence.co.uk/uploads/files/pdf/failing-to-stop-or-report-accident-penalty-pdf.pdf
* - that's 6 months in custody, not a 6 month disqualification.
So, it seems to me that she may be facing a fine, a minimum of 10 points on the licence, and/or disqualification.